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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

Man’s best friend may be nature’s worst enemy, study on pet dogs finds

While ecological damage caused by cats has been extensively studied, the new research found dogs, as the world’s most common large carnivores, present a significant and multifaceted environmental threat.

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New Curtin University research into the overlooked environmental impact of pet dogs has found far-reaching negative effects on wildlife, ecosystems and climate.

While ecological damage caused by cats has been extensively studied, the new research found dogs, as the world’s most common large carnivores, present a significant and multifaceted environmental threat.

Lead researcher Associate Professor Bill Bateman, from Curtin’s School of Molecular and Life Sciences, said the research found that human-owned, pet dogs disturb and directly harm wildlife, particularly shorebirds, even when leashed.

“As well as predatory behaviour like chasing wildlife, dogs leave scents, urine and faeces, which can disrupt animal behaviour long after the dogs have left,” Associate Professor Bateman said. “Studies have found that animals like deer, foxes and bobcats in the US are less active or completely avoid areas where dogs are regularly walked, even in the absence of the dogs.”

Dog waste also contributes to pollution in waterways and inhibits plant growth, while wash-off from chemical treatments used to clean and guard dogs from parasites can add toxic compounds to aquatic environments.

“In addition, the pet food industry, driven by a vast global dog population, has a substantial carbon, land and water footprint.”

Associate Professor Bateman said addressing these challenges required a careful balance between reducing environmental harm and maintaining the positive role of dogs as companions and working animals.

“Dogs are incredibly important to people’s lives and their roles range from providing companionship to contributing to conservation efforts as detection dogs,” Associate Professor Bateman said. “However, the sheer number of pet dogs globally, combined with uninformed or lax behaviours by some owners, is driving environmental issues that we can no longer ignore.”

The study also sheds light on barriers to sustainable pet ownership, finding that while the dog food industry is a key factor in national sustainability action plans, only 12 to 16 per cent of dog owners are willing to pay more for eco-friendly pet food, largely due to rising costs. Additionally, a lack of awareness among owners about the impact of dogs on the environment compounds the issue.

“Many owners simply don’t realise the environmental damage dogs can cause, from disturbing wildlife to polluting ecosystems,” Associate Professor Bateman said. “Others may feel their individual actions won’t make a difference, leading to a ‘tragedy of the commons’ where shared spaces like beaches and woodlands suffer cumulative degradation.

Restrictive measures, such as banning dogs from sensitive areas are necessary for protecting vulnerable species but they are not a complete solution. “We are calling for a collaborative effort between dog owners, conservation groups and policymakers to develop strategies that balance pet ownership with environmental care.”

The paper, ‘Bad Dog? The environmental effects of owned dogs,’ has been published in Pacific Conservation Biology and can be found online here: https://doi.org/10.1071/PC24071.

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Pet Care

4 Vet-approved tips to show your pets love

Consider these vet-recommended ways to show your pets just how much you love them.

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For pet parents, every day is another chance to shower their pets with love.

But as FYI: Did you know that in the US alone, people spent a record $27.5 billion during Valentine’s Day, 32% purchased gifts for their pets, according to an annual survey conducted by the National Retail Federation and Prosper Insights & Analytics.

“Dogs are very in tune with their pet parents’ emotions,” said Dr Aziza Glass, expert vet for Freshpet. “Pups are sure to feel the love from the actions and little things pet parents do.”

Consider these vet-recommended ways to show your pets just how much you love them:

  • Cook a batch of pet-friendly treats: Since the classic Valentine’s Day gifts of chocolate and candies are out of the question for dogs, homemade treats are a great alternative. Dehydrated veggies and fruit treats are easy options. All you need to do is choose pet-safe fruits and vegetables and bake them for a few hours. Some pet-friendly foods include strawberries (loaded with vitamins C, B1, B6, K and more), cranberries (include antioxidants to help prevent inflammation) and beets (packed with fiber, vitamins and minerals).
  • Switch to a fresh, healthy diet: The way to your pet’s heart is often through his or her stomach. One of the best ways you can show your love is by making the switch to fresh food like Freshpet, the leading fresh pet food brand. Freshpet is not only nutritious, but also made with fresh meat and veggies, so it’s great for picky eaters.
  • Create sustainable DIY toys: Sure, you can buy your pup a new toy this Valentine’s Day, or you can make your own with items lying around your house. It’s quick and easy to make a crinkle chew toy. If your dog likes that crinkle sound, try covering an empty plastic water bottle with a sock or two. Your dog will go nuts for the sounds it makes when chewing and it’s a green way to reuse before recycling.
  • Plan a doggie play date: Socialization is important for everyone – dogs and humans alike. Head to a nearby dog park or plan a play date with some neighborhood friends to get your dog out and playing with others. In addition to providing an excuse to run around with friends, your pup will thank you for it later.

By sharing these thoughtful gestures, dogs will be showering their pet parents with kisses, which triggers endorphins in both dogs and humans, reinforcing the bond between the two even more.

Discover more ways to show your pets some love by visiting Freshpet.com.

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Pet Care

How to protect your pet’s dental health

By the age of 3, 80% of pets experience some form of dental health issue, and the risk only increases as they age. However, for many pet owners, taking care of their four-legged friends’ oral health is a more difficult habit to maintain than their own daily brushing and flossing routine.

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Like humans, pets’ oral hygiene plays an important role in their overall health and quality of life. Common conditions like plaque buildup, tartar and bad breath can escalate to serious health conditions if untreated. 

In fact, by the age of 3, 80% of pets experience some form of dental health issue, and the risk only increases as they age. However, for many pet owners, taking care of their four-legged friends’ oral health is a more difficult habit to maintain than their own daily brushing and flossing routine.

Many veterinarians recommend regular brushing for pets, and a wide array of treats and meal additives complement brushing to help support your pet’s oral health.

Protecting your pet’s oral health begins by talking with your veterinarian, who can provide recommendations tailored to your pet’s specific needs. With that guidance, you can start comparison shopping and reading labels so you can identify quality products. Remember you’re likely to find the greatest success by introducing oral health products as part of your pet’s daily routine early on.

Certifications for Trust and Quality
Products that meet high standards are eligible for certifications that assure consumers about their quality and efficacy. For example, the VOHC (Veterinary Oral Health Council) is an independent organization that evaluates pet dental products. Their Seal of Acceptance is awarded to products that meet strict standards for controlling plaque and tartar. You can find the seal on packaging as an easy visual indication of the product’s quality standards.

Natural, Effective Ingredients
Look for products that prioritize safety and health by offering natural, clinically proven ingredients and no artificial additives or chemicals. Seaweed (or kelp) is a preferred ingredient because it contains minerals and enzymes that help reduce plaque and prevent bacteria.

You can find 100% natural and organic kelp in products like ProDen PlaqueOff®, which includes A.N ProDen®, a kelp ingredient sustainably harvested from specially selected locations in the pristine North Atlantic waters off the Scandinavian coastline. Processed through a specialized method in extreme environmental conditions, it attains peak quality and effectiveness, ensuring safety and health for your pet.

Sustainable Practices
Another detail you can gather from the product’s packaging is whether a product manufacturer adheres to environmentally friendly practices and safe ingredient sourcing, which means the product is not only good for pets but also for the planet. This may be evident in certifications or special icons on the packaging, through information about sustainably harvested ingredients or with packaging that itself is environmentally responsible. 

Tailoring to Individual Pets
Different pets have different needs based on age, size, breed and oral health status. Selecting the right product may also be complicated by your pet’s allergies or picky eating habits. You can find a variety of ingestible options, including powders, chews or bones like those offered by ProDen PlaqueOff®, to use in conjunction with daily brushing.

  • Powder: Ideal for a seamless addition to your pet’s diet, this is the most economical choice, particularly for long-term use. It’s especially suitable for younger pets as a preventive measure, given its longevity and cost-effectiveness. 
  • Chews: For those looking for an easy-to-administer option that doubles as a reward, chews are the way to go. Additionally, for older pets or those with missing teeth, soft chews can offer a gentle yet effective way to maintain oral health. They’re a convenient choice for pet owners to give as a daily dose without the need for measuring or mixing.
  • Bones: Designed not only to satisfy your dog’s natural chewing instincts but also to aid in dental care, bones are a perfect option for pet parents whose dogs prefer a longer-lasting treat. Bones come in a variety of flavors and sizes, catering to both large and small breeds, making them a versatile way to help keep your dog’s teeth clean and their breath fresh. 

Learn more about protecting your pet’s dental health at us.swedencare.com.

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