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Size matters: How body size shapes dogs’ aging patterns

Smaller dogs may live twice as long life as their larger counterparts. But does this size difference also impact how dogs age in terms of behavior and cognitive abilities?

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Smaller dogs may live twice as long life as their larger counterparts. But does this size difference also impact how dogs age in terms of behavior and cognitive abilities? Based on the data of 15,000 dogs, researchers from ELTE Eötvös Loránd University, Budapest, found that larger dogs experience an earlier onset of age-related decline (at around seven-eight years of age versus ten-eleven years in smaller dogs), but also a slower decline rate compared to smaller dogs. Additionally, the study also points out that, although larger dogs have somewhat shorter lifespans, they also maintain their cognitive health longer and experience a smaller degree of age-related decline than their smaller counterparts.

The average life expectancy of dogs varies more than two-fold between breeds, with giant dogs generally living to seven years and small dogs to fourteen. Purebreds also have a shorter life span than mixed breeds. However, little is known about how life expectancy is related to age-related behavioral and cognitive decline. In a study published in GeroScience, researchers from ELTE Eötvös Loránd University, Budapest, explored the intriguing connection between a dog’s size and its aging process.  

The researchers collected data from over 15,000 dogs and assessed the age trajectories of various behavioral characteristics and the prevalence of canine cognitive dysfunction. They investigated at what age the behavioral and cognitive changes start, how fast the changes progress, and also examined factors like the dog’s body size, head shape, purebred status in relation to these age-related changes.

According to the results, behavioral and cognitive aging in dogs begin around ten and a half years of age, but the onset of aging, as well as the aging rate depend on the body size of the dogs. Dogs weighing over thirty kilogram (66 lbs) show an earlier onset of age-related decline by two-three years, but the rate of decline is slower compared to smaller dogs. “Larger dogs experience a physical breakdown at an earlier age, and the accumulating illnesses, and degradation in sensory functions leads to ‘old age behaviors’ long before their mental decline would begin.” – explained Borbála Turcsán, first author of the study.

On the other hand,

dogs weighing less than approximately seven kilogram (14 lbs) exhibited over four times higher prevalence of cognitive decline in old age than larger dogs, supporting the idea that although larger dogs have a shorter lifespan, they also experience a more limited degree of cognitive decline.

Unexpectedly, long-nosed (dolichocephalic) dogs, such as greyhounds, and purebreds have a higher risk of developing cognitive decline in old age compared to meso- and brachycephalic dogs and mixed-breeds. 

One of the most interesting findings of the study was that owners started to consider their dogs “old” around the age of six, regardless of the size of the dog or its purebred status. “Owners consider their dogs “old’ four to five years earlier than would be expected from behavioral data. This may be due to graying and barely noticeable changes,” explained Enikő Kubinyi, Head of the Senior Family Dog Project.

The new research highlights that body size not only influences a dog’s life expectancy, but also its healthspan.

However, the effect is not gradual, as only extreme size groups, the very small (toy) or very large (giant) dogs have markedly different aging trajectories. “For those who want a smaller sized dog but do not want to risk severe mental health problems in old age or want a larger sized dog but do not want to risk physical health problems at 7-8 years of age, we recommend a dog from the 10-30 kg size range.”  – explained Turcsán. “Based on our results, these dogs have a longer healthspan relative to their expected lifespan than their smaller and larger counterparts.”

Pet Care

Tips to keep pets safe and happy no matter the season

The American Veterinary Medical Association (AVMA) is reminding everyone to keep pets safe no matter the season, and to think twice before gifting a pet as a surprise.

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Special occasions can be a magical time, but they can also present hidden pet hazards and difficult decisions for pet owners and gift-givers. The American Veterinary Medical Association (AVMA) is reminding everyone to keep pets safe no matter the season, and to think twice before gifting a pet as a surprise.

“Holiday celebrations often mean delicious foods, beautiful decorations, and friends and family, which can be wonderful for us but may pose unexpected risks to our pets,” says Dr. Michael Q. Bailey, president of the AVMA. “The best gift you can give your pet… is the gift of good health and safety, which means keeping seasonal hazards out of reach, providing a quiet space away from the hustle and bustle, and ensuring emergency plans are in place in case the unexpected happens.”

Common hazards for pets include chocolate, baked goods (especially those containing the sugar substitute xylitol), table scraps, and certain seasonal plants like lilies, holly, and mistletoe. Tinsel, candles, electrical cords, and trees can also lead to injuries or worse if pets decide to investigate too closely.

Thinking about gifting a pet? Think again.
While the idea of a new puppy or kitten under the tree may warm hearts, the AVMA cautions against surprising someone with a live animal. Pets are long-term commitments that require a significant amount of time, planning, financial resources, and emotional investment.

“Bringing a pet into someone’s life is a decision that should never be made impulsively, and never without the foreknowledge of the recipient,” says Dr. Bailey. “Pets can bring immense joy, but they also require daily care, training, veterinary visits, and love for many years. A better option might be wrapping up a collar, toy, or gift certificate, and involving the future pet owner in choosing their new companion when the time is right.”

Instead of gifting a live animal, the AVMA recommends more thoughtful alternatives, such as:

  • A leash or collar with a note promising a trip to a shelter or reputable breeder
  • Books on pet care or breed characteristics
  • A donation in the recipient’s name to a local animal shelter

Healthy gift ideas for pets
If your own pets are on your holiday list, the AVMA suggests practical and healthy gifts, such as:

  • A veterinary wellness exam
  • Toys that encourage exercise and mental stimulation
  • Nutritional treats made for pets
  • Updated parasite prevention
  • Pet insurance
  • A microchip (or updating existing chip info)

“Even something as simple as a microchip can be a lifesaving gift if your pet ever becomes lost,” adds Dr. Bailey. “It’s a gift that lasts a lifetime, and helps to ensure that you will be reunited if you and your pets become separated.”

For more holiday pet safety tips and resources, visit AVMA.org/holiday.

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Pet Care

Plant-based dog foods are better for the environment than red meat options

Plant-based diets for pets had the lowest impact across all measures of environmental impact. This included the land needed to produce them, greenhouse gas emissions, the polluting effects of production on soil and water reservoirs, and freshwater withdrawal.

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A study, led by experts at the University of Nottingham, has found that the production of meat-based pet foods has a much greater impact on the environment in comparison to plant-based alternatives.

The study, led by Rebecca Brociek from the School of Veterinary Medicine and Science, and published in Frontiers in Nutrition – Nutrition and Sustainable Diets, showed that plant-based diets for pets had the lowest impact across all measures of environmental impact. This included the land needed to produce them, greenhouse gas emissions, the polluting effects of production on soil and water reservoirs, and freshwater withdrawal.

Pet food production contributes substantially to global environmental issues, driven largely by animal-derived ingredients.

In this study, experts quantified the environmental impact of 31 commercially available dry dog foods purchased in the UK, categorised as plant-based, red-meat based and veterinary-renal diets.

The environmental metrics were estimated using life cycle assessment datasets and adjusted for ingredient makeup, energy density and differences in moisture content, which were mostly taken from the dog food packaging.

The results showed that plant-based diets had the lowest impact across all measures of environmental impact. Poultry-based and veterinary diets were intermediate, while beef and lamb-based foods had substantially higher impact compared to all other foods.

For example, over nine years of adult life, a 20kg dog fed a beef-based diet was estimated to require 57 football fields worth of land to grow their food (versus 1.4 fields for plant-based).

This latest study comes after a previous study where the team showed that plant-based pet food sold in the UK provided similar nutrition to meat-based food.

“Our findings show that there is a much greater environmental impact when producing meat-based pet food.

 “We have already show in our previous work that plant-based diets at the point of purchase are roughly equivalent to others. This next paper is a case study of 31 supermarket-available dog foods, giving dog owners who factor sustainability into their purchases, guidance on how to also reduce their environmental pawprint,” says Rebecca, the lead author on the study.

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Pet Care

Back-to-school season can be ruff on pets

The “back-to-school blues” can affect dogs and cats alike, but there are things you can do to help ease their transition.

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After a summer of lazy mornings, long walks, and extra attention from the kids at home, the sudden shift to hectic mornings, rushed drop-offs, and quiet households during the day can be confusing and stressful for our furry companions. The “back-to-school blues” can affect dogs and cats alike, but there are things you can do to help ease their transition.

Pets Feel the Change

Dogs and cats thrive on routine and companionship. When their human family suddenly disappears during the day, they may experience boredom and separation anxiety, or changes in appetite and behavior. 

Easing the Transition

1. Gradual Changes

If your kids haven’t started school yet, start adjusting your pet’s routine one to two weeks before school starts. Slowly shift feeding, walking, and play times to match the upcoming schedule. Making incremental changes will make the adjustment feel less abrupt for our pets.

2. Spend Quality Time in the Morning and Evenings

Spend a few minutes each morning playing with or walking your dog. This gives pets a positive start to the day and reinforces their bond with the family. Exercising your dog in the morning also helps them burn off nervous energy so they can nap during the day. After school and work, be sure to give pets plenty of love, attention, and exercise. A walk, cuddle session, or playtime helps them feel valued and part of the family again.

3. Keep Them Busy and Distracted

Turn on the TV or radio to help make the house less quiet. Give your pet a puzzle toy and a new chew toy to keep them busy when they are home alone. Besides making a variety of chews to match your dog’s needs and preferences, Nylabone makes innovative treat toys designed to keep your dog entertained longer. Their Stuffable Cone Dog Treat Toy and Fillable Peanut Dog Chew Toy allow you to put treats in the toy so your dog can stay preoccupied for hours trying to get the treats out. And as a bonus, in celebration of their 70th birthday, Nylabone is donating a chew toy to Best Friends Animal Society for every purchased Nylabone. In addition to helping your dog stay busy, you’re helping enrich a shelter pet’s life. For more information or to upload your receipt go to: NylaboneCares.com

4. Give Them a Cozy New Bed

Buy your dog or a cat a new bed to encourage naps and relaxation while everyone is away. P.L.A.Y has a large selection of cozy, comfortable, and easy to maintain beds. Their California Dreaming Memory Foam Bed has plush bolster sides and a memory foam center cushion to provide extra comfort and support for your pup.

5. Watch for Signs of Stress

Excessive barking, chewing, bathroom accidents, or changes in behavior might be signs of separation anxiety. Consider trying calming products to help decrease your pet’s anxiety. There are all kinds of calming products available nowadays designed to decrease stress and anxiety in dogs and cats. Also consider doggy day care or setting up afternoon dog walks to get some of your pet’s energy out and break up their day. And remember if none of this helps, be sure to contact your veterinarian for help.

Pets Are Part of the Family Too

Back-to-school season is a time of growth and change, not just for children but for the whole household. With a little empathy and effort, your pets can adjust to the new routine and continue to thrive. There is no better way to end the school day, then coming home and being greeted by your four-legged friend waiting at the door.

For more about pet health or some pet-friendly ideas go to https://drruthpetvet.com/.
Facebook @DrRuthMacPete
Instagram @drruthmacpete

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