Can Dogs Tell the Difference Between Dogs and Other Animals?

By Dr Duncan Houston

A Chihuahua and a Great Dane look strikingly different to us. Yet dogs can recognise features that place very different-looking animals in the same broad category.

The useful question on a walk is what happens after that recognition. A dog can recognise another dog and still want more space, show little interest or become overexcited.

Quick Answer

Yes. Research shows that dogs can distinguish images of other dogs from images of other animals, despite substantial differences in appearance. Sight, sound and smell provide different kinds of social information, but recognising another dog does not establish that the two animals will get along.

What does the research actually show?

Dogs can group different-looking dog faces together

In a 2013 study by Autier-Dérian and colleagues, nine pet dogs learned a rewarded screen-choice task. They then distinguished unfamiliar dog-head photographs from other animal images, including humans, across varied dog appearances.

This supports visual categorisation of dogs. It does not show that dogs know human breed names or classify every animal they encounter correctly. The study excluded wolf and fox images, and a photograph-choice experiment cannot predict a real-life greeting.

Dogs can also connect dog sounds with dog videos

A 2021 experiment involving 32 pet dogs paired videos of dogs or unfamiliar animals with barking or an unfamiliar sound. Their attention patterns differed between matching and mismatched combinations. The researchers interpreted this as evidence that dogs recognised the dog videos as representing their own species.

The study adds evidence beyond still photographs. It does not mean every dog must react to a television dog, or that a dog understands a screen in the same way a person does.

Smell adds information that a picture cannot provide

Research on dogs' brain responses to familiar and unfamiliar scents found that a familiar person's scent produced a different reward-related response from other tested scents. The person did not need to be present. This supports the importance of learned social information carried by odour.

That experiment compared human and dog scents, but its strongest finding concerned the familiar human. It should not be stretched into proof that a sniff tells a dog everything about another animal's identity, intentions or safety.

Recognition, familiarity and friendliness are different questions

When interpreting an encounter, separate three ideas:

• Species recognition: can the dog distinguish a dog from another type of animal?
• Individual familiarity: has this dog met that particular animal before?
• Willingness to interact: is either animal comfortable with what is happening now?

A familiar companion and an unfamiliar dog may produce different responses even though both are dogs. Equally, a dog may choose to avoid an animal they recognise. These distinctions are an interpretation of what the research can and cannot establish, rather than a way to read a dog's private thoughts.

RSPCA guidance on meeting new dogs notes that dogs differ in how much company they enjoy. Some prefer their own space. Choosing a quiet route past another dog can be an entirely reasonable outcome.

What should you watch during a meeting?

Read the whole animal, the situation and changes from their usual behaviour. The RSPCA's dog body-language guide is a useful starting point.

• Comfortable observation: a loose posture, relaxed face and freedom to look away support continuing calmly at the current distance. They do not require you to arrange contact.
• Uncomfortable: crouching, a tucked tail, ears held back or repeated attempts to turn away mean the dog needs space. Pause the approach and move away.
• Stop the approach: marked stiffness, growling or showing teeth are reasons to end the interaction. Do not move closer to test whether the dog is serious.

Look at both dogs. One enthusiastic animal does not make an encounter comfortable for the other. A moving tail alone is not enough information to decide.

How can you support calm encounters?

1. Observe before approaching. Ask the other handler whether a greeting is appropriate, and leave enough room to pass without contact.
2. Keep a route away. Avoid trapping either dog in a narrow entrance or holding them close together for an inspection. Follow their comfort rather than a fixed greeting schedule.
3. Reward a useful choice. Practise looking back towards you and moving away on cue in an easy setting first. Reward those responses when another animal appears at a manageable distance.
4. End before the encounter becomes difficult. If either animal wants to leave, allow it. Do not insist that they finish saying hello.

The American Veterinary Society of Animal Behavior recommends reward-based training and an environment that helps the dog succeed. Shouting, leash corrections or forcing prolonged exposure add unnecessary pressure.

For a practical record, note the animal involved, the setting, what happened immediately beforehand and whether your dog could disengage. Compare the next similar encounter without deliberately provoking a reaction. Persistent difficulty is a reason to ask your veterinarian about appropriate behaviour support.

Common mistakes to avoid

• Assuming a bark proves the dog has mistaken another animal for a dog
• Using one good greeting as permission for every future meeting
• Interpreting reluctance to approach as a failure that needs correcting
• Using unfamiliar cats, wildlife or livestock to test recognition

Frequently Asked Questions

Can dogs recognise their own breed?

The photograph research supports recognising dogs across varied appearances. It does not establish that dogs identify their own breed as a human-defined category.

Does barking at the television mean my dog recognises the dog?

It may be a response to the image, movement, sound or a combination. Controlled video research supports recognition abilities, but a single reaction at home cannot identify which cue mattered.

Does ignoring other dogs mean my dog cannot recognise them?

No such conclusion follows. Recognition and choosing to interact are separate. Use your dog's broader behaviour and usual preferences to understand the encounter.

Should I let my dog sniff every dog they meet?

No. Let both animals' comfort and both handlers' judgement guide the decision. Passing with space is a valid choice.

The practical takeaway

Dogs have demonstrated impressive recognition abilities, but a species label is only part of an encounter. Your most useful job is to notice comfort, protect the option to leave and reward calm choices.

For further everyday pet-care reading, explore ASK A VET™.