Why Do Cats Live Longer Than Dogs?

Have you ever wondered why our feline friends tend to outlive their canine companions? It’s a question that comes up often among pet parents—especially in households that include both species. Now, new research is shedding light on this mystery, and the answer may surprise you: it’s not just about genetics or size—it’s also about brain power and immune system strength.

Bigger Brains, Longer Lives?

A global team of scientists, led by the University of Bath, recently studied 46 different mammal species to explore what influences their maximum lifespan potential—that’s the longest recorded life of a species, not just the average.

What they found? Mammals with larger brains and stronger immune systems tend to live longer. Cats, for example, not only have impressive intelligence for their size, but they also show greater investment in immune-related genes than many other species—including most dogs.

So, when your cat stares at you like she’s judging your every move... she might just be planning her next two decades.

Immunity Is the Unsung Hero

Beyond brain size, the researchers discovered that long-lived mammals share one thing in common: a complex and resilient immune system. Why does that matter?

A strong immune system doesn’t just fight off infections—it:

• Clears away aging or damaged cells

• Helps prevent cancer

• Supports the body’s ability to bounce back from illness or injury

Interestingly, some small-brained animals—like mole rats and certain bat species—also live surprisingly long lives. When their genomes were studied, it turned out they too had expanded families of immune-related genes. So even when brain size isn’t a factor, a well-equipped immune system can still support a long, healthy life.

What Does This Mean for Dogs?

While dogs generally have shorter lifespans than cats, there’s a wide range depending on breed, size, and health. Larger dogs, in particular, tend to have shorter lives—but this research suggests that immune health may be just as important as genetics.

As pet parents, this reinforces the importance of:

• Regular veterinary checkups

• A balanced, immune-supporting diet

• Proactive care and enrichment that keeps both the mind and body active

At Dogs On The Run, we believe care is about more than feeding and walking—it’s about long-term wellness, trust, and being part of the journey every step of the way.

This research doesn’t just explain why cats often live longer—it highlights something bigger: that longevity is complex, and often influenced by how the brain and body evolve together. It also reminds us how important immune resilience is—not just in science, but in the everyday lives of our pets.

So the next time your cat seems smug while your dog snores on the couch… remember, science may be on her side. But with proactive, loving care, your dog can enjoy a vibrant, happy life too—and we’re here to support that every step of the way.

At DOTR, we’re proud to be more than a pet service—we’re a community built on care, connection, and purpose.

Let us know how we can support your pet’s long, healthy life.