Are Dogs Happier With Another Dog? What the Evidence Actually Says

It is the thing everyone says. Dogs are pack animals, so they need another dog.

It sounds obviously true, and most of the internet repeats it without pausing. But look a little closer and the story gets wobbly. When someone actually filmed pet dogs at home alone, they found something close to the opposite.

So here is the honest version, and how to work out whether your own dog would be happier with company.

If you do go ahead, it is worth knowing that multi-pet insurance puts both dogs on one policy with a single renewal date, which is one less thing to juggle later on.

Are Dogs Happier With Another Dog?

Some are and some are not. Dogs are social, but that does not mean every dog wants a housemate, and nobody has shown that a companion dog makes the average pet dog happier.

What does hold up is narrower. Dogs raised alongside other dogs tend to be more confident around the dogs they meet.

That is a real benefit. It is just not the one most people are buying.

And if you are agonising over this, you are in good company. According to the Dogs Trust National Dog Survey 2024, 74% of dog-owning homes in the UK have exactly one dog, and a fifth have two.

You are in the majority, not behind.

What Happened When Researchers Actually Filmed Dogs Home Alone

Most advice on this subject is written from the armchair. One team went and looked.

They set up cameras in the homes of pet dogs left alone as part of their normal routine, some living as the only dog, some living with others. The question was simple: does another dog make your absence easier?

It did not. Dogs in multi-dog homes were roughly twice as active as the solo dogs, the whining was no quieter, and the males actually vocalised more.

Then came the detail that should give everyone pause. Across the whole time they were filmed, the dogs living together spent 0.24% of it interacting with each other (Stephan, Leidhold and Hammerschmidt, Applied Animal Behaviour Science, 2021).

Not a typo. Under a quarter of one percent.

Two dogs in a house are not necessarily two dogs together. Quite often they are two dogs separately waiting for you by the door.

Will a Second Dog Fix Separation Anxiety?

No. It is the most common reason people give for getting a second dog, and it is the one that holds up least well.

Separation anxiety is about you leaving, not about the room being empty. Filling the room with another dog does not touch the cause.

Studies from the US and the UK, two decades apart, came to the same answer: having other pets at home made no difference to whether a dog struggled when left. What did make a difference was living with a single adult, which roughly doubled the odds (Flannigan and Dodman, JAVMA, 2001).

Sound familiar? If your dog falls apart when you pick up your keys, the fix is the leaving, not the company. Our guide to how long you can leave a dog alone covers where to start.

Does a Companion Dog Help a Dog Live Longer?

You will read this claim a lot. Nobody has ever tested it.

The biggest lifespan study of UK dogs broke things down by breed, crossbreed status, size, sex and even skull shape. Whether the dog lived with another dog was not on the list.

The study that usually gets quoted as proof found that dogs living with other pets had better health scores, as reported by their owners. Interesting, but it was a snapshot, not a measure of lifespan.

The authors themselves said they could not tell which way round it worked. Owners of dogs already in poorer health may simply do less socialising, which would produce the same pattern in reverse.

So: possibly. Nobody knows. Anyone telling you it is settled has not read the small print.

The One Benefit That Does Hold Up

Here is the good news. Growing up around other dogs does make a difference, and it is worth taking seriously.

A long-running study that followed dogs over eleven years found that those from single-dog homes had 44% higher odds of being fearful of other dogs, and were a bit harder to train as young adults (Powell and colleagues, Preventive Veterinary Medicine, 2025).

Notice that this is a different claim from the one everyone makes. The benefit is not that the dog is less lonely. It is that the dog is more comfortable around other dogs.

For plenty of owners, that is the thing that would change their life. A dog who can walk past another dog without stiffening is a dog you can take more places.

How to Tell Whether Your Dog Actually Wants Canine Company

This is the practical bit most articles skip, which is a shame, because you can answer it by watching your own dog.

Does your dog seek out other dogs on walks, or greet them politely and move on? Seeking out is a signal. Polite tolerance is not.

When they play, is it loose and bouncy with plenty of pauses, or fast, stiff and one-sided? Good play has breaks in it.

How do they cope when a visiting dog wanders over to their bed, their bowl or their person? That is the test that matters, because a housemate does it every single day.

Are they over seven, settled, and increasingly fond of the sofa? Older dogs often find a young housemate more stressful than rejuvenating.

And the awkward one. Are you getting a second dog for your dog, or for yourself? Both are fine reasons, and being clear about which will lead you to a better choice of dog.

What to Do Instead, If the Problem Is Loneliness

If the real issue is that your dog is alone for too long, another dog is an expensive answer to the wrong question.

A dog walker or a midday visit changes the thing that actually matters. So does day care a couple of times a week, which gives your dog some dog-to-dog time without you taking on a second animal for the next twelve years.

And if your dog is truly distressed when you leave, a qualified behaviourist is the right call. Very few people make it: among dogs in the Dogs Trust survey who rarely relaxed when left alone, only 4% had ever seen one.

If You Do Get a Second Dog

Then the question stops being whether and starts being which, and that is a far more useful question. Temperament, energy and play style matter much more than breed.

A small admission from anyone who has lived with two dogs: the arguments are usually about stuff, not personality. Beds, bowls and toys cause more trouble than clashing characters.

On the admin side, putting both dogs on one policy is simpler than running two. Pet insurance for multiple pets keeps one renewal date and one set of paperwork, with cover still tailored to each animal, which matters when you have a senior and a puppy with very different needs.

Before any of that, though, read our honest answer to whether two dogs are harder than one. The first six months are the hard part, and knowing that going in makes the decision a calmer one.

The Short Version

Dogs are social animals who do not necessarily want a flatmate. The loneliness argument is weaker than it sounds, the separation anxiety argument does not stand up, and the lifespan argument has never been tested.

The one that does hold up is about social confidence, and it is a good one.

So get a second dog because you want one, and because you have taken a good look at the dog you already have and think they would enjoy it. That beats any of the myths.

Whichever way you land on a second dog, the admin gets easier if you sort cover early. Comparing pet insurance before the second arrival typically means one renewal date instead of two and no gap while you work out the paperwork.