Category Archives: Longevity

Why is a Dog Lifespan and Cat Lifespan So Much Shorter Than Ours?

 Why is a dog lifespan and cat lifespan so much shorter than ours?
When you’re a vet, it’s not uncommon for an owner with a sick or dying pet to look at you, usually with tears in their eyes, and tell you they wished their dog or cat could live as long as they did. Why is it that the lifespans of dogs and cats are so much shorter than those of humans? Why can’t they stay with us longer?
To answer this, consider that everything about a dog or cat’s life, from their growth to their ability to learn, is accelerated.
Tooth development is a great example of this. Puppies and kittens are born with no teeth, begin to acquire their baby teeth in as little as 3 weeks, and have all their baby teeth by 45 days. Puppies and kittens generally have all of their adult teeth by the time they are 6 months old. Compare that to the development of humans, in which it can take 4 to 7 months for the immature (baby) teeth to start coming in.
Another way that growth is accelerated is in reproduction. Dogs and cats can be reproductively active as young as 6 months. When a dog or cat gets pregnant, they deliver their young in 60 to 65 days, often producing a litter ranging from a few to over a dozen offspring.
All of this expedited growth means that the bodies of dogs and cats do an immense amount of work that can hasten the aging process. Consider, too, that the processes involved in day-to-day life also require a lot of resources. Humans have a normal body temperature of approximately 98.6 degrees Fahrenheit (F), but dogs and cats maintain normal body temperatures in the 100.5 to 102.5 degrees F range. Those extra few degrees mean your dog or cat’s body is working extra hard every day, even when they are fully grown. In addition, the metabolism of dogs and cats is much higher than that of humans, who burn calories at about half the rate of the most common animal companions.
With all this acceleration, the senior years start early. For cats, it may be as early as age 8; for dogs, the senior age frequently starts at 4 or 5 years for large or giant breed dogs or 8 or more years for small breed dogs. The lifespan of some large breed dogs can be as little as 7 years, such as the case with Great Danes.
This still doesn’t totally answer the question of why the lifespans of dogs and cats are so much shorter, though, so we spent hours of research and called a number of professors and professionals. As it turns out, when all was said and done we learned that no one really knows why this happens.
Scientists suggest that a combination of genetics, inbreeding, metabolism, and evolution are all components of why a dog or cat’s life span is so much shorter than a human’s.
A study published in the Proceedings of the National Academy of Sciences by Professor Herman Pontzer of Hunter College, New York, helped to give us some insight. Pontzer and his associates worked with 17 primate species to determine how the body used energy and to characterize their overall metabolic rates. The results of their study showed that the lower metabolic rate of primates, and thus humans, was associated with a prolonged lifespan (compared to those of dogs and cats).
Current research does not have a definitive answer to the question of why dogs and cats don’t live as long as humans. However, it has enabled us to enrich the lives of our pets so they can enjoy every moment to the fullest. We may never be able to give our animal companions the same length of life that we have, but we are better equipped than ever to make every minute special for them.
Diana Ruth Davidson, Chief Pet Officer and Managing Nanny, Westside Dog Nanny
We offer pet services such as:  Pet Sitting,  In-Home Dog Boarding, Dog Walking, Overnights in your home, Doggie Day Care.
310 919 9372



The Feline Quality of Life Scale Helps You Determine If It’s Time to Say Goodbye to Your Cat

A pet hospice devised this method of adding some objectivity into this highly emotional situation.

When you first brought home that bouncy kitty, end-of-life decisions were the farthest thing from your mind. But things have changed. Either the years have flown by and you’re now looking at a frail old kitty, or your vet has handed you a devastating diagnosis. Or maybe your cat is fine but you’re just worried about the inevitable.

The sad truth is that unless you are elderly or terminally ill, chances are you will someday have to face your cat’s mortality. It’s an issue that no cat parent wants to confront.

I had to use the QoL Scale this week with my beloved Groucho.

I have nursed my own kitties and foster cats through pancreatitis, fatty liver disease, and cancer. Sometimes we win, sometimes we lose. But when, for the good of your cat, do you throw in the proverbial towel? I’ve said so many times, “I wish they could talk to me.”

Until recently, vets have told me it’s time to say goodbye to a sick kitty when she stops eating. But any number of treatable or temporary conditions can cause a cat to ignore the food bowl: dental disease, nausea, viruses, and parasites, among others.

How do you assess your cat’s quality of life?

How do you know when mounting symptoms and cascading organ failure reduce your kitty’s quality of life to an intolerable level? Whether your kitty is facing advanced age or a terminal illness, you have an obligation to assess his quality of life and to maintain the best quality possible.

Use this scale to assess your cat’s quality of life. Used by permission of Pawspice

It’s also important to determine if the recommended treatment will further deteriorate your cat’s quality of life. Is the potential benefit worth the cost to your pet? When should you abandon treatment?

Alice Villalobos, a renowned veterinary oncologist, founded pet hospice service Pawspice and has been a pioneer in end-of-life-care for animals for 20 years. In 2004, she developed theFeline Quality of Life (QoL) Scale (PDF), based on the Five Freedoms of Animal Welfare for farm animals in the United Kingdom, to help veterinarians and families assess a pet’s life quality and help pet owners look at hard-to-face issues.

You can assess your pet’s QoL on a monthly, weekly, daily, or hourly basis as needed and make end-of-life decisions more objectively. “Focusing on QoL for companion animals with life-limiting disease may avoid futile medicine, over-treatment, and reluctant early euthanasia,” she says.

I recently learned firsthand, the QoL Scale may help you objectively make one of the most difficult decisions of your life — and help allay the guilt that comes with the decision to humanely euthanize your beloved pet rather than force her to linger.

“The QoL scale helps all caregivers to ask themselves if they are truly able to provide enough care to properly maintain their ailing pet’s QoL,” Dr. Villalobos says.

How the Feline Quality of Life Scale works

The scale rates seven basic factors (Hurt, Hunger, Hydration, Hygiene, Happiness, Mobility, and More Good Days Than Bad) from 1 to 10, with 10 being the best possible score. A total score of 70 is perfect, while a total greater than 35 is deemed acceptable for maintaining a good feline hospice or treatment program.

“Modern pain management, high-tech medicine, and good nursing care can restore and maintain QoL, and can extend the period between the diagnosis of a terminal disease and death,” Dr. Villalobos says.

When my 18-year-old cat Nixie was fighting pancreatitis, I pulled up the QoL Scale and rated her condition. The first time I used it, Nixie scored 36. A few days later, I could no longer hydrate her with subcutaneous fluids because fluid was collecting in her abdomen, a symptom of heart failure. The score dropped to 33.

I was willing to nurse Nixie 24/7 and mortgage my house to pay to keep her going, but her QoL had deteriorated. By continuing to force-feed and medicate, I would only be prolonging her misery. Thankfully, the QoL Scale opened my eyes, and that day I released my Heart Kitty. My life hasn’t been the same since, but I know I didn’t prolong her pain for my own benefit.

Here’s how to interpret the seven stages of the Quality of Life Scale:

1. Hurt

Adequate pain control, including the cat’s ability to breathe, is first and foremost on the scale. People don’t realize that in human medicine, not being able to breathe is ranked at the top of the pain scale. “Breathing is No. 1 on the QoL Scale because if you can’t breathe, nothing else matters,” Dr. Villalobos says. Humans describe breathing difficulty as being more painful than a broken bone.

“Monitor the pet’s respirations to identify labored breathing so you won’t wait too long to provide relief,” she says. “Respiratory distress is an emergency and it must be relieved immediately, or there is no QoL for the animal, and there is no humane justification to continue the hospice.”


Symptoms of pain in a cat include increased vocalizations, panting or open-mouth breathing, constantly licking a particular area, hiding or avoiding interaction with family, irritability when touched, not eating, not being able to jump up to favorite places, change in litter box habits, and nonstop purring (yes, cats purr to soothe themselves).

2. Hunger

Often kitties can hide weight loss beneath their coats, so monitoring your sick or senior pet’s weight is essential. If your cat isn’t willingly eating, your veterinarian can prescribe appetite stimulants such as mirtazapine. Under your vet’s supervision, you can coax, hand-feed, force-feed, or even have an esophageal feeding tube surgically implanted.

3. Hydration

Every ailing kitty should receive adequate fluids: two teaspoons or 10 ml per pound per day. You can check your kitty for dehydration by lifting his skin between the shoulder blades and see how fast it returns. The skin of a hydrated animal will spring back to his muscle almost immediately, while a dehydrated animal’s skin will return more slowly. Dehydrated kitties will have tacky-feeling gums and their eyes may appear sunken.


To supplement your cat’s fluid intake, your vet will probably prescribe subcutaneous fluids, which your vet can teach you to give your kitty. Providing fluids at home can make a huge difference in your cat’s life QoL and can save you a great deal of money.

4. Hygiene

Is your kitty brushed and clean? Is his coat matted? Can he use the litter box or does he lie in his own eliminations?

Cats who can’t move away from their waste will develop painful sores. Cat with oral disease can’t groom themselves, so they quickly become demoralized. You can help your unkempt kitty stay clean by dampening a sponge with a highly diluted solution of lemon juice and hydrogen peroxide, and gently stroke his face, paws and legs, similar to the way a mother’s tongue would do it.

5. Happiness

Happiness is important for both you and your kitty. Dr. Villalobos believes that even at end-of-life there should be a two-way exchange of pleasure and contentment between you and your cat. You need to provide enrichment that encourages as much fun and mental stimulation as possible.


Schedule some fun time. Does he paw at his favorite toy or does he ignore it? Does he sleep with you? Does he still enjoy sitting on your lap and being caressed? It is easy to see that our pets communicate with their eyes. Does he respond to a pinch of catnip? Or does he seem depressed, lonely, anxious, bored, or afraid? Does he isolate himself?

6. Mobility

This is relative. Is your cat able to get up and move around enough to satisfy normal desires? Is he having seizures or stumbling? Does he need help to get in the litter box to eliminate?

7. More Good Days Than Bad

Bad days might include vomiting, nausea, diarrhea, frustration, falling down, or seizures. “When there are too many bad days in a row (or if the pet seems to be turned off to life), the quality of life is compromised,” Dr. Villalobos says.

Making the decision to end your beloved cat’s life by euthanasia is probably one of the most difficult decisions you’ll ever make. In the last two months, I have had to use the Quality of Life Scale for two kitties. The scale helped me make the correct and humane yet heartbreaking decision.

Was there guilt? Yes, some. But the QoL Scale helped me understand that I saved my babies a long, painful, lingering death. Knowing how Nixie was miserable took most of my guilt away. For the first time, I know I didn’t wait too long. I also know I made the right decision.

Hopefully it will be many years before you need the QoL Scale, but when the time comes, use the compassionate tool together with your vet to prevent your pet’s unnecessary suffering. Freedom from pain is a gift for your cat. Freedom from guilt is a gift for you. 

Diana Ruth Davidson, Chief Pet Officer and Managing Nanny, Westside Dog Nanny

We offer pet services such as:  Pet Sitting,  In-Home Dog Boarding, Dog Walking, Overnights in your home, Doggie Day Care.
310 919 9372