If you’re wondering how to help your dog or cat live longer, the short answer is: keep them at a healthy weight, feed a complete and balanced diet, stay current on veterinary checkups, and build in daily movement and mental stimulation. There’s no single supplement or trick that guarantees extra years, but consistent, vet-guided habits give your pet the best shot at a longer, healthier life.

What Actually Affects How Long Your Pet Lives?

Genetics set a baseline, but day-to-day care has a real influence on how many healthy years your pet enjoys. Understanding the factors you can and can’t control helps you focus your energy where it matters most.

Breed, Size, and Genetics

Smaller dog breeds tend to live longer on average than large and giant breeds, and mixed-breed cats and dogs often have fewer inherited health issues than some purebred lines, according to the American Kennel Club (AKC). You can’t change your pet’s genetics, but knowing your breed’s common health risks helps you and your vet watch for problems early.

Weight and Body Condition

Carrying excess weight is one of the most common and most preventable threats to a pet’s lifespan. Extra pounds put strain on joints, the heart, and other organs, and can shorten a healthy pet’s life. The ASPCA notes that maintaining a healthy body weight is one of the most effective ways owners can support their pet’s long-term health.

Diet & Nutrition Habits That Support Longevity

Nutrition is one of the biggest levers you control every single day. Small, consistent choices at mealtime add up over a pet’s lifetime.

Feeding a Complete and Balanced Diet

Choose a food formulated to meet your pet’s life stage — puppy or kitten, adult, or senior — and look for products that meet FDA labeling standards for complete and balanced nutrition. If you’re considering a home-cooked or specialty diet, work with your veterinarian or a board-certified veterinary nutritionist first, since it’s easy to unintentionally create nutrient gaps.

Weight Management and Portion Control

Measure meals instead of free-feeding, limit treats to a small share of daily calories, and recheck portions whenever your vet updates your pet’s target weight. A body condition score check at each vet visit is a simple, objective way to track progress over time.

Related reading: How to Read a Pet Food Label Like a Vet and Best Feeding Schedules for Dogs and Cats by Age.

Supplements Pet Owners Often Ask Their Vet About

Supplements are not a substitute for good nutrition or veterinary care, and no supplement is proven to extend lifespan on its own. That said, several categories come up often in conversations with veterinarians for supporting comfort and quality of life in aging pets.

Omega-3 Fatty Acids

Fish oil supplements are among the most frequently recommended by veterinarians for general wellness, but the right amount depends on your pet’s size and health status, so it’s best determined by your vet rather than a general product label.

Joint Support Supplements

Many owners of senior dogs ask about joint supplements as mobility slows with age. These are often used alongside — not instead of — weight control and vet-guided pain management. Never start a new supplement without checking for interactions with existing medications.

Curious what to avoid altogether? See our upcoming guide to toxic foods for pets for a full list based on ASPCA guidance.

Daily Habits That Add Healthy Years

Beyond diet, the habits you build into everyday life matter just as much for a pet’s long-term health and happiness.

Preventive Veterinary Care

The American Veterinary Medical Association (AVMA) generally recommends annual wellness exams for adult pets and twice-yearly visits for senior pets, since aging pets can develop new health issues quickly between visits. Regular bloodwork and dental checks help catch problems while they’re still manageable.

Exercise, Mental Stimulation, and Dental Care

• Daily movement: Walks, play sessions, and cat-appropriate climbing or chasing games support heart health and healthy weight.
• Mental enrichment: Puzzle feeders, training, and new environments help keep aging minds active.
• Dental care: Untreated dental disease can affect more than the mouth. Regular brushing and professional cleanings, as recommended by your vet, support overall health.

For more on building an enrichment routine, check out our guide to mental enrichment for senior pets and signs your dog or cat may be entering their senior years.

Frequently Asked Questions

The Bottom Line

There’s no shortcut to a longer life for your dog or cat, but the fundamentals work: a balanced diet, healthy weight, regular vet visits, daily movement, and thoughtful use of vet-approved supplements. Small, consistent habits today can add up to more good years together.

Sources referenced: American Veterinary Medical Association (AVMA), American Kennel Club (AKC), ASPCA, U.S. Food and Drug Administration (FDA).