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Better care means dogs and cats are living longer now than they ever have before—and, as pets get older, they need extra care and attention.

It’s important to remember that age is not a disease. Although senior pets may develop age-related problems, you can help your pet live a happy, healthy, and active life in their senior years by providing for their physical, mental, and health care needs.

Regular veterinary examinations can detect problems in older pets, before those problems become serious or life-threatening, which can lead to a longer, healthier life for your pet.

When does a pet become a “senior”?

The short answer: it varies.

Cats are generally considered “senior” after 10 years of age. However, dogs don’t have a universal age of seniority because of their wider variety in size. Larger breed dogs tend to have shorter life spans than smaller breeds. For this and other reasons, experts suggest that dogs be considered “senior” when they reach the last 25 percent of the estimated life span for their breed. On average, using data from the American Kennel Club, this translates to the following ages:

Small or toy breeds (less than 20 pounds): 8 to 11 years
Medium-sized breeds (20 to 50 pounds): 8 to 10 years
Large breeds (50 to 90 pounds): 8 to 9 years
Giant breeds (more than 90 pounds): 6 to 7 years

What do senior pets need to stay happy and healthy for as long as possible?

No matter how well cared for, senior pets are vulnerable to aging-related issues, including certain diseases. This means that senior pets require more attention than younger pets, including more frequent visits to the veterinarian as well as possible changes in their diet and home environment.

Here are some basic considerations when caring for senior pets:

  • Increased veterinary care: Senior pets need to see a veterinarian twice a year or more so signs of illness or other problems can be found and treated early, before they become bigger problems. Senior pet exams are similar to those for younger pets but more in-depth. These exams may include dental care, possible bloodwork, and specific checks for signs of aging-related diseases.
  • Diet and nutrition: Senior pets often need foods that are more easily digested, provide different energy levels and ingredients, and contain anti-aging nutrients.
  • Weight control: Weight gain in senior dogs increases the risk of health problems, whereas weight loss is a bigger concern for senior cats.
  • Parasite control: Senior pets’ immune systems aren’t as strong as those of younger pets. As a result, senior pets may not be able to fight off parasites or heal as fast.
  • Vaccination: A weaker immune system means senior pets also might have different vaccination needs than younger pets.
  • Maintaining mobility: Pets can become less active with age. Keeping senior pets active through appropriate exercise helps them stay healthier and more mobile.
  • Mental health: Senior pets can show signs of senility or cognitive dysfunction. Stimulating them through interactions can help keep them mentally active.
  • Environment: Senior pets may need changes in their lifestyle, such as new sleeping areas to avoid stairs, more time indoors, etc.
  • Reproductive diseases: Non-neutered/non-spayed senior pets are at higher risk of breast, testicular, and prostate cancers.

Your veterinarian can help you with all of these considerations and provide you with recommendations tailored to your pet.

What health problems and changes are common in senior pets?

While it’s easy to spot the outward signs of aging such as graying haircoat and slower pace, it’s important to remember a pet’s body is also changing on the inside. Senior pets are more likely to develop certain health problems. Cancer is the cause of death in almost half of dogs and about a third of cats over 10 years old. Here are some signs of cancer to look out for:

Abdominal swelling
Bleeding from the mouth, nose, or other body openings
Difficulty eating, swallowing, or breathing
Lumps, bumps, or discolored skin
Non-healing sores
Persistent diarrhea or vomiting
Decreased appetite or body weight
Unexplained swelling, heat, pain, or lameness

Here are some of the other most common health problems as pets age:

  • Heart disease
  • Kidney or urinary tract disease
  • Liver disease
  • Diabetes
  • Joint or bone disease
  • Overweight or obesity

Vision or hearing loss

It is normal for pets to lose some of their sight and hearing as they age, similar to people. Senior pets might develop cataracts affecting their vision, and they might not respond as well to voice commands.

Pets with poor eyesight or even blindness can still get around well as long as they are familiar with their surroundings. If your pet’s eyesight is failing, avoid rearranging or adding furniture or other items that could become obstacles.

Teaching your pet hand signals at a younger age might make it easier for you to communicate with your pet as their hearing worsens with age. Training them to respond to simple gestures that indicate “come” or “stop” can allow you to safely retain control of your pet without the use of words.

Changes in your Senior Pet’s Behavior

Behavior changes in your pet can be the first signs of aging. These changes might be due to discomfort or pain (as with arthritis), worsening sight or hearing, certain diseases, or just the normal aging process. A type of brain impairment called “cognitive dysfunction,” which is similar to senility in people, also may be responsible.

Common behavior changes in senior pets with cognitive dysfunction include the following:

  • Increased reaction to strange or loud sounds
  • Increased barking/meowing
  • Increased aggressive/protective behavior
  • Increased anxiety
  • Acting disoriented or confused
  • Increased wandering
  • House soiling (“accidents”)
  • Changes in sleep patterns
  • Less interest in playing
  • Repeating the same actions over and over
  • Decreased response to voice commands
  • Poorer memory and learning ability

If your pet is showing of these behavior changes or other warning signs of disease, contact your veterinarian and let them know the specific changes you’ve seen. Sometimes, the changes may seem contradictory — such as signs of hearing loss but increased sensitivity to strange sounds.

Certain diets, medications, and opportunities to interact with their environment can help support brain function in senior pets. Your veterinarian can recommend which ones might be right for your pet.


Changes in your pet’s activity level can be a warning sign of underlying disease. A common cause of activity change is arthritis. You may notice that your pet is starting to avoid activities like running, jumping, climbing stairs, or getting into cars. Other signs of arthritis include the following:

  • Favoring a leg
  • Walking stiffly
  • Difficulty sitting down or standing up
  • Sleeping more
  • Resisting being touched or petted
  • Playing less
  • Showing unusual aggression towards people or other pets

There may be other reasons for these changes, too. All are good reasons to have your veterinarian examine your pet to find out what’s going on.

Advances in veterinary medicine have made it easier to diagnose and effectively treat arthritis and other aging-related diseases. Your veterinarian can recommend the best tests to determine why your pet’s activity level or other behaviors have changed. Once the cause is found, your veterinarian can recommend the most effective treatment.

And treatment doesn’t stop with medications. If your pet has arthritis, simple changes or additions to your home can help them feel more comfortable. Examples include orthopedic pet beds, raised feeding platforms, and pet stairs and ramps.

How does weight affect senior pets?

Excess weight can have a major effect on a senior pet’s health. Obesity in senior pets is linked to an increased risk of arthritis, difficulty breathing, insulin resistance or diabetes, heart disease, high blood pressure, skin problems, cancer, and other conditions. An overweight pet may not show any early warning signs of health problems, which is one reason why regular visits to your veterinarian are so important. Once your veterinarian evaluates your pet’s condition, they can recommend diet and other changes to help set up your pet for a long, healthy, comfortable life.

On the other hand, sudden weight loss in a senior pet often means something is wrong, especially in cats. Hyperthyroidism (overactive thyroid gland), cancer, diabetes, and kidney disease are common causes. If you notice any sudden changes in your pet’s weight, contact your veterinarian.

Should new pets be brought into a home with a senior pet?
It may be tempting to bring a new pet—especially a puppy or kitten—into your home as your pet gets older. It’s a good idea to first consult with your veterinarian to ensure the best outcome for your pet and your family. Ideally, a new pet would be introduced when your senior pet is still active and can move away if a “time-out” is needed. Senior pets need to know they have a quiet, secure place where they can walk away and rest, undisturbed, in comfort.

How will I know when it’s time to say goodbye?

The decision to euthanize a pet can be the most difficult—yet kindest—decision a pet owner will make. Sometimes, euthanasia is obviously the best thing to do for your pet. Other times, however, it can be hard to know whether a pet is having more bad days than good, or the pet’s quality of life is suffering.

Although the timing of euthanasia is a personal decision, you have help in making that choice. Your veterinarian can help walk you through any questions or concerns you have, including an honest evaluation of your pet’s quality of life.