The area immediately around an animal in which the presence of others is treated as significant.

The concept of personal space (sometimes called individual distance) was developed in classical ethology and has applications across many social species. Crossing into another animal’s personal space can produce avoidance (the other moves away), displacement (the other shifts position without conflict), or agonistic response (the other escalates) depending on the relationship between the individuals and the context of the encounter.

Personal space varies between species. Cats typically maintain larger individual distances than dogs from non-preferred conspecifics; dogs typically maintain larger individual distances than horses from non-preferred conspecifics; horses in stable herds often tolerate quite close proximity from preferred partners while maintaining greater distance from non-preferred individuals. The species-typical patterns reflect evolutionary history, social organisation, and current welfare conditions.

Personal space also varies between individuals within a species. Some individuals are more tolerant of close approach than others, and the differences can be large. A confident, well-socialised dog may have a much smaller personal space than a fearful or under-socialised dog. A horse with extensive social experience and stable affiliative bonds may have different personal space patterns than a horse with limited social experience.

Personal space varies between contexts. Animals are typically more tolerant of close approach from preferred partners than from strangers; more tolerant in familiar environments than in novel ones; more tolerant when not stressed than when stressed. The same individual can have quite different personal space patterns at different times.

The concept matters for handling. Approaching an animal within their personal space without first establishing the relationship and context for the approach often produces an avoidance, displacement, or aggressive response, which can be interpreted by the handler as a behavioural problem rather than as a normal response to the personal-space violation. Skilled handling involves reading the individual’s current personal space requirements and respecting them in the approach.