Can Dogs Tell Other Dogs From Different Animals?

By Dr Duncan Houston

A Chihuahua and a Great Dane can look less alike than two completely different animals. Yet dogs can sort surprisingly varied dog faces into the same category. That ability helps explain why a dog may react differently to another dog, a cat or a horse.

Recognition is only part of the encounter. A dog can recognise another dog and still be uncertain about approaching. Understanding that difference is useful when you plan walks, introductions and enrichment.

Quick Answer

Yes. Controlled studies show that dogs can distinguish images of other dogs from images of different species, despite large differences in breed appearance. Video research also supports recognition that combines visual and sound information. This does not guarantee friendly behaviour or safe contact with an unfamiliar animal.

What has actually been tested?

Recognising very different dog faces

In a study of visual species discrimination, nine dogs learned a rewarded image-choice task. They then grouped photographs of unfamiliar dog heads together despite differences in breed and appearance. The comparison images included other mammals and people.

This demonstrates a visual categorisation ability under the study conditions. It does not tell us that dogs think about species in the same verbal way a person does, or that every dog will respond identically to every photograph.

Matching movement with sound

A separate experiment with 32 pet dogs used videos and animal sounds. Patterns of attention differed when a barking sound was paired with a dog video rather than unfamiliar combinations. The findings support recognition of other dogs in moving images, while also illustrating how carefully these experiments must be interpreted.

Neither study is a test of whether your dog will enjoy a particular introduction. Scientific evidence about recognition cannot replace observing the animals in front of you.

Recognition, familiarity and friendliness are different

• Species recognition: distinguishing a dog from a different kind of animal
• Individual recognition: recognising a particular familiar companion
• Comfort: feeling able to share space without being overwhelmed
• Social choice: deciding whether to approach, play, investigate or leave

These can vary independently. Your dog may know the neighbour's dog well and avoid an unfamiliar dog of the same breed. A dog who lives comfortably with one cat may behave very differently around a cat running across a garden.

Why a real encounter is more complicated than a photograph

Outside a laboratory, animals move, make sounds, approach and retreat. The setting also changes the experience: a narrow doorway offers fewer options than an open area, and a tight lead can limit movement. Previous encounters and the current distance matter alongside what the other animal looks like.

A useful owner record therefore describes events rather than assigning a motive. “Stopped and stared when the cat ran across the drive” is clearer than “did not know it was a cat.” Note what happened immediately before and after the reaction.

Use this knowledge during introductions

Before the animals meet

Decide whether direct contact is necessary at all. Passing calmly at a distance can be a successful outcome. Check that each animal has a secure route away and that the person handling each animal can control the situation without forcing a greeting.

With cats or smaller animals, physical separation needs to remain reliable. A dog looking curious is not evidence that a shared room will be safe. Do not use a small animal in a cage as a training prop or an informal test of the dog's self-control.

During the encounter

Choose enough space to observe rather than immediately moving closer. Notice the whole sequence: can the dog look away, respond to a familiar cue and move with you, or are they becoming more fixed on the other animal? If the setup is becoming difficult, create distance or end the attempt.

Reward the calm behaviour you want in that setting. Keep greetings optional. The AVSAB training position supports reward-based methods and avoiding forced, aversive approaches.

After the encounter

Record the distance, setting and response. Repeat an easier setup before adding another challenge. Changing location, movement and proximity together makes it harder to learn what helped.

Decide whether to continue, simplify or stop

• Continue gently: both animals can disengage and have space to leave. Keep the encounter brief and optional.
• Simplify: attention becomes increasingly fixed or either animal repeatedly avoids the interaction. Add distance and reduce the demands.
• Stop: safe separation is uncertain or an animal is being chased, cornered or forced to remain. Restore a secure barrier and seek qualified help before trying again.

This is an interaction-management framework, not a diagnosis of aggression or anxiety. If introductions repeatedly become unsafe, a qualified reward-based professional can help you plan the next step.

Enrichment that does not require meeting animals

Species-recognition research does not mean a dog needs a crowded social calendar. Scent exploration on a quiet walk, a familiar search game and learning a simple cue offer useful engagement without arranging a new animal encounter. Select activities the individual dog enjoys and can leave voluntarily.

Common mistakes

• Assuming recognising another dog means wanting to greet it
• Using breed, size or a wagging tail as the only guide to compatibility
• Letting animals “work it out” without a safe way to separate them
• Repeating an overwhelming encounter in the hope familiarity alone will solve it
• Playing loud animal sounds to provoke a reaction for a video

Frequently Asked Questions

Can a small dog recognise a very large dog as a dog?

The photo research supports recognition across varied dog appearances. It does not establish how comfortable one individual will feel around another.

Does barking at a dog on television mean my dog is confused?

That reaction alone cannot tell you what your dog understands. Movement, sound and previous learning can all affect the response. Turn it off if the experience is upsetting.

Do dogs recognise cats?

Dogs can distinguish animal cues and learn about animals they encounter. The studies described here support dog-species recognition; they do not prove that every dog has identical knowledge of every other species.

Should I let my dog sniff every dog we pass?

No. Comfortable, controlled passing is useful in its own right. Ask the other handler before a greeting and keep both dogs free to decline.

The useful takeaway

Dogs can notice much more than a shared four-legged shape. Use that understanding to make encounters predictable, spacious and optional. What matters on the next walk is the actual response of each animal, not proving what your dog knows.

ASK A VET™ encourages careful observation and practical choices that make everyday life with your dog easier.