Pyrenean Mastiff

Your Pyrenean Mastiff

Caring for Your Faithful Companion

Pyrenean Mastiffs: What a Unique Breed!

Your dog is special! She’s your best friend, companion, and a source of unconditional love. Chances are that you chose her because you like Pyrenean Mastiffs and you expected her to have certain traits that would fit your lifestyle:

  • Agile, sturdy, and muscular
  • Great with kids and other dogs: a true family pet
  • Protective of owners; excellent guard dog
  • Easily motivated and trainable
  • Confident and self-reliant

However, no dog is perfect! You may have also noticed these characteristics:

  • Can be rambunctious and rowdy, especially as a puppy
  • Takes up a lot of room due to her massive size
  • Needs frequent attention from her family
  • Suspicious of strangers
  • Can be gassy and drool a lot

Is it all worth it? Of course! She’s full of personality, and you love her for it! She is watchful and calm, but can be overly territorial. With early socialization and training, she is a loving and peaceful family pet.

The Pyrenean Mastiff is a rare breed that originated in Spain. They were bred to guard and defend herds of sheep from wolves, bears, and thieves on their migration between grazing areas. The Pyrenean Mastiff is a strong and even-tempered breed. They are not aggressive, but they will defend their “flock” with tenacity if they feel that family or property is threatened. The Pyrenean Mastiff is a generally healthy breed with an average lifespan of 8-12 years.

Your Pyrenean Mastiff’s Health

We know that because you care so much about your dog, you want to take good care of her. That is why we have summarized the health concerns we will be discussing with you over the life of your PM. By knowing about health concerns specific to Pyrenean Mastiffs, we can tailor a preventive health plan to watch for and hopefully prevent some predictable risks.

Many diseases and health conditions are genetic, meaning they are related to your pet’s breed. re is a general consensus among canine genetic researchers and veterinary practitioners that the conditions we’ve described herein have a significant rate of incidence and/or impact in this breed.That does not mean your dog will have these problems; it just means that she is more at risk than other dogs. We will describe the most common issues seen inPyrenean Mastiffsto give you an idea of what may come up in her future. Of course, we can’t cover every possibility here, so always check with us if you notice any unusual signs or symptoms.

This guide contains general health information important to all canines as well as the most important genetic predispositions for Pyrenean Mastiffs. This information helps you and us together plan for your pet’s unique medical needs. At the end of the booklet, we have also included a description of what you can do at home to keep your Pyrenean Mastiff looking and feeling her best. You will know what to watch for, and we will all feel better knowing that we’re taking the best possible care of your pal.

General Health Information for your Pyrenean Mastiff

Brushing your dog’s teeth daily will prevent periodontal disease.

Brushing your dog’s teeth daily will prevent periodontal disease.

Dental Disease

Dental disease is the most common chronic problem in pets, affecting 80% of all dogs by age two. And unfortunately, your Pyrenean Mastiff is more likely than other dogs to have problems with her teeth. It starts with tartar build-up on the teeth and progresses to infection of the gums and roots of the teeth. If we don’t prevent or treat dental disease, your buddy will lose her teeth and be in danger of damaging her kidneys, liver, heart, and joints. In fact, your Mastiff’s life span may be cut short by one to three years! We’ll clean your dog’s teeth regularly and let you know what you can do at home to keep those pearly whites clean.


Pyrenean Mastiffs are susceptible to bacterial and viral infections—the same ones that all dogs can get—such as parvo, rabies, and distemper. Many of these infections are preventable through vaccination, which we will recommend based on the diseases we see in our area, herage, and other factors.


Obesity can be a significant health problem in Pyrenean Mastiffs. It is a serious disease that may causeor worsen joint problems, metabolic and digestive disorders, back pain and heart disease. Though it’s tempting to give your pal food when she looks at you with those soulful eyes, you can “love her to death” with leftover people food and doggie treats. Instead, give her a hug, brush her fur or teeth, play a game with her, or perhaps take her for a walk. She’ll feel better, and so will you!

Roundworm egg as seen under the microscope.

Roundworm egg as seen under the microscope.


All kinds of worms and bugs can invade your Pyrenean Mastiff’s body, inside and out. Everything from fleas and ticks to ear mites can infest herskin and ears. Hookworms, roundworms, heartworms, and whipworms can get into hersystem in a number of ways: drinking unclean water, walking on contaminated soil, or being bitten by an infected mosquito. Some of these parasites can be transmitted to you or a family member and are a serious concern for everyone. For your canine friend, these parasites can cause pain, discomfort, and even death, so it’s important that we test for them on a regular basis. We’ll also recommend preventive medication as necessary to keep her healthy.

Spay or Neuter

One of the best things you can do for your PM is to have her spayed (neutered for males). In females, this means we surgically remove the ovaries and usually the uterus, and in males, it means we surgically remove the testicles. Spaying or neutering decreases the likelihood of certain types of cancers and eliminates the possibility of your pet becoming pregnant or fathering unwanted puppies. Performing this surgery also gives us a chance, while your pet is under anesthesia, to identify and address some of the diseases your dog is likely to develop. For example, if your pet needs hip X-rays or a puppy tooth extracted, this would be a good time. This is convenient for you and easy for your friend. Routine blood testing prior to surgery also helps us to identify and take precautions for common problems that increase anesthetic or surgical risk. Don’t worry; we’ll discuss the specific problems we will be looking for when the time arrives.

Genetic Predispositions for Pyrenean Mastiffs

Gastric Dilatation and Volvulus

Gastric Dilatation and Volvulus


Gastric Dilatation and Volvulus, also known as GDV or Bloat, usually occurs in dogs with deep, narrow chests. This means your PM is more at risk than other breeds. When a dog bloats, the stomach twists on itself and fills with gas. The twisting cuts off blood supply to the stomach, and sometimes the spleen. Left untreated, the disease is quickly fatal, sometimes in as little as 30 minutes. Your dog may retch or heave (but little or nothing comes out), act restless, have an enlarged abdomen, or lie in a prayer position (front feet down, rear end up). Preventive surgery in which the stomach is tacked down or sutured in place so that it is unlikely to twist is an option. If you see symptoms, take your pet to an emergency hospital immediately!

Bone and Joint Problems

A number of different musculoskeletal problems have been reported in Pyrenean Mastiffs. While it may seem overwhelming, each condition can be diagnosed and treated to prevent undue pain and suffering. With diligent observation at home and knowledge about the diseases that may affect your friend’s bones, joints, or muscles you will be able to take great care of him throughout his life.

X-ray demonstrating elbow dysplasia. The red arrow points to the ununited anconeal process, a form of elbow dysplasia. This abnormal bone fragment causes joint inflammation and pain.

X-ray demonstrating elbow dysplasia. The red arrow points to the ununited anconeal process, a form of elbow dysplasia. This abnormal bone fragment causes joint inflammation and pain.

Both hips and elbows are at risk for dysplasia , an inherited disease that causes the joints to develop improperly and results in arthritis. Stiffness in your PM’s elbows or hips may become a problem for him, especially as he matures. You may notice that he begins to show lameness in his legs or has difficulty getting up from lying down. We can treat the arthritis—the sooner the better—to minimize discomfort and pain. We’ll take X-rays of your dog’s bones to identify issues as early as possible. Surgery is sometimes a good option in severe and life-limiting cases. Keep in mind that overweight dogs may develop arthritis years earlier than those of normal weight, causing undue pain and suffering!

Many older dogs have arthritis , and bigger dogs tend to have more pain and disability than smaller dogs. Pyrenean Mastiffs are particularly prone to developing arthritis, for which we need to use many treatments. The earlier we begin treatment, the better the results. Good nutrition and proper exercise are also very important to help reduce bone and joint problems as your pet gets older. Do not let him become overweight; this puts a huge strain on the joints.

Intervertebral disc disease. Note how the cushion of the disc materal has extruded and puts pressure on the spinal nerves.

Intervertebral disc disease. Note how the cushion of the disc materal has extruded and puts pressure on the spinal nerves.

Intervertebral disc disease (IVDD ) is a common condition in PMs. The disease is caused when the jelly-like cushion between one or more vertebrae slips or ruptures, causing the disc to press on the spinal cord. If your dog is suddenly unable or unwilling to jump up, go up stairs, is reluctant to move around, has a hunched back, cries out, or refuses to eat or go potty, he is likely in severe pain. He may even drag his back feet or be suddenly paralyzed and unable to get up or use his back legs. If you see symptoms, don’t wait. Call us or an emergency clinic immediately! For less severe cases, rest and medication may resolve the problem. In many cases involving paralysis, we’ll recommend surgical removal of the ruptured discs (within 24 hours of the onset of symptoms to get the best results). As with so many other diseases, weight control helps to prevent this problem. You should also use ramps or steps from puppyhood on so that your dog doesn’t spend a lifetime stressing his back by jumping on and off of the furniture.

When PM puppies are allowed to grow too quickly, the cartilage in their joints may not attach to the bone properly. This problem is known as osteochondritis dissecans or OCD. If this occurs, surgery may be required to fix the problem. It’s best to stick to our recommended growth rate of no more than four pounds per week. Don’t overfeed him and don’t supplement with additional calcium. Feed a large-breed puppy diet rather than an adult or a regular puppy diet. Weigh your puppy every three to four weeks.

Sometimes your PM’s kneecap (patella) may slip out of place (called patellar luxation). You might notice that he runs along and suddenly picks up a back leg and skips or hops for a few strides. Then he kicks his leg out sideways to pop the kneecap back in place, and he’s fine again. If the problem is mild and involves only one leg, your friend may not require much treatment beyond arthritis medication. When symptoms are severe, surgery may be needed to realign the kneecap to keep it from popping out of place.

Inflammatory Bowel Disease

Inflammatory Bowel Disease or IBD is an immune system disorder common in PMs in which the intestinal lining becomes overrun with immune system cells called lymphocytes and plasmacytes. The stomach and/or intestinal lining becomes thickened affecting his ability to absorb nutrients properly. Chronic vomiting or diarrhea is common or it may flare up suddenly and then improve again for a time. Stress, diet change, or intestinal parasites may make it worse. If your friend has diarrhea or digestive upsets that are not explained by the more common reasons, diagnostic tests, which may include intestinal biopsy, will be needed. Lifetime medications and special diets are usually required to keep this bellyache under control.

Eye Problems

Not many things have as dramatic an impact on your dog’s quality of life as the proper functioning of his eyes. Unfortunately, Pyrenean Mastiffs can inherit or develop a number of different eye conditions, some of which may cause blindness if not treated right away, and most of which can be extremely painful! We will evaluate his eyes at every examination to look for any signs of concern.

Entropion. Notice how the lower lid curls in towards the surface of the eye to cause irritation.

Entropion. Notice how the lower lid curls in towards the surface of the eye to cause irritation.

Entropion is a condition where the eyelid rolls inward, causing the eyelashes to rub against the cornea (surface of the eyeball). This is an extremely irritating and painful condition that can ultimately lead to blindness. It can happen in any dog breed; however, your PM is especially at risk for this heritable disorder. Surgical correction is usually successful if performed early.

Ectropion is a defect where the eyelids droop or hang away from the eye. While ectropion can cause those sad looking puppy dog eyes, the problem more importantly exposes the eye to environmental contaminants and leads to irritation, drying, and can progress to eye infections. PMs are a bit more likely than other dogs to show this deformity. The good news is it can usually be surgically corrected.

Glaucoma, an eye condition that affects Pyrenean Mastiffs and people too, is an extremely painful disease that rapidly leads to blindness if left untreated. Symptoms include squinting, watery eyes, bluing of the cornea (the clear front part of the eye), and redness in the whites of the eyes. Pain is rarely noticed by pet owners though it is frequently there and can be severe. People who have certain types of glaucoma often report it feels like being stabbed in the eye with an ice pick! Yikes! In advanced cases, the eye may look enlarged or swollen like it’s bulging. We’ll perform his annual glaucoma screening to diagnose and start treatment as early as possible. Glaucoma is a medical emergency. If you see symptoms, don’t wait to call us, go to an emergency clinic!

Cataracts are a common cause of blindness in older PMs. We’ll watch for the lenses of his eyes to become more opaque—meaning they look cloudy instead of clear—when we examine him. Many dogs adjust well to losing their vision and get along just fine. Surgery to remove cataracts and restore sight may also be an option.

Dogs have a third eyelid that contains a gland that produces about one-third of the fluid that bathes the eye. If the gland is sore or swollen, it looks like a red blob in the corner of the eye. This condition is called cherry eye, and it can occur very suddenly in one or both eyes. It’s more common in puppies or young PMs. If this happens to him, we may treat it with ointment first, but surgery is often the best option.

Dental Abnormalities

Teeth abnormalities are often genetically induced and are relatively common in dogs, especially in purebred dogs like your PM. An overbite or underbite is called a malocclusion, or a bad bite. Oligodontia is a condition where only a few teeth are present. Misaligned teeth can also occur and cause lots of problems, but can usually be corrected with braces or extractions. (Yes, dogs can get braces!) We want to keep your buddy’s teeth healthy so we will be watching his developing teeth closely.

The thyroid glands rest on both sides of the neck alongside the windpipe.

The thyroid glands rest on both sides of the neck alongside the windpipe.

Thyroid Problems

PMs are prone to a common condition called hypothyroidism in which the body doesn’t make enough thyroid hormone. Signs can include dry skin and coat, hair loss, susceptibility to other skin diseases, weight gain, fearfulness, aggression, or other behavioral changes. We’ll conduct a blood screening test annually to screen for the disease. Treatment is usually simple: replacement hormones given in the form of a pill.

Taking Care of Your Pyrenean Mastiff at Home

Much of what you can do to keep your dog happy and healthy is common sense, just like it is for people. Watch her diet, make sure she gets plenty of exercise, regularly brush her teeth and coat, and call us or a pet emergency hospital when something seems unusual (see “What to Watch For” below). Be sure to adhere to the schedule of examinations and vaccinations that we recommend for her. This is when we’ll give her the necessary “check-ups” and test for diseases and conditions that are common in PMs. Another very important step in caring for your pet is signing up for pet health insurance. There will certainly be medical tests and procedures she will need throughout her life and pet health insurance will help you cover those costs.

Routine Care, Diet, and Exercise

Build her routine care into your schedule to help your Pyrenean Mastiff live longer, stay healthier, and be happier during her lifetime. We cannot overemphasize the importance of a proper diet and exercise routine.

  • Supervise your pet as you would a toddler. Keep doors closed, pick up after yourself, and block off rooms as necessary. This will keep her out of trouble and away from objects she shouldn’t put in her mouth.
  • Brush her coat as needed, at least weekly.
  • Pyrenean Mastiffs often have serious problems with their teeth, so you’ll need to brush them at least three times a week!
  • Clean her ears weekly, even as a puppy. Don’t worry—we’ll show you how!
  • She’s a smart dog with lots of energy, so keep her mind and body active, or she’ll get bored. That’s when the naughty stuff starts.
  • She can have a high prey drive, so she needs to be leash walked and a sturdy fence is a must.
  • Keep your dog’s diet consistent and don’t give her people food.
  • Feed a high-quality diet appropriate for her age.
  • Exercise your dog regularly, but don’t overdo it at first.

What to Watch For

Any abnormal symptom could be a sign of serious disease, or it could just be a minor or temporary problem. The important thing is to be able to tell when to seek veterinary help, and how urgently. Many diseases cause dogs to have a characteristic combination of symptoms, which together can be a clear signal that your Pyrenean Mastiff needs help.

Office calls

Give us a call for an appointment if you notice any of these types of signs:

  • Change in appetite or water consumption
  • Tartar build-up, bad breath, red gums, or broken teeth
  • Itchy skin (scratching, chewing, or licking), hair loss
  • Lethargy, mental dullness, or excessive sleeping
  • Fearfulness, aggression, or other behavioral changes
  • Dull coat, hair loss, sluggish, weight gain


Seek medical care immediately if you notice any of these types of signs:

  • Scratching or shaking the head, tender ears, or ear discharge
  • Inability or straining to urinate; discolored urine
  • Cloudiness, redness, itching, or any other abnormality involving the eyes
  • Dry heaving or a large, tight, painful abdomen
  • Leg stiffness, reluctance to rise, sit, use stairs, run, jump, or “bunny hopping”

Partners in Health Care

DNA testing is a rapidly advancing field with new tests constantly emerging to help in the diagnosis of inherited diseases before they can become a problem for your friend. For the most up-to-date information on DNA and other screening tests available for your pal, visit

Your PM counts on you to take good care of her, and we look forward to working with you to ensure that she lives a long and healthy life. Our goal is to provide the best health care possible: health care that’s based on her breed, lifestyle, and age. Please contact us when you have questions or concerns.


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