Sleep aggression is quite a common behaviour in all dog breeds, but especially in retired greyhounds. Retired greyhounds must get used to sharing household space with other members of the family, including children and other pets, rather than having their own private ‘den’. They may feel that they need to be ‘on their guard’, even subconsciously while they’re napping. Many retired racing greyhounds exhibit sleep aggression for reasons related to their background, not their personalities. Like all post-adoption adjustment issues, dealing with sleep aggression involves time, patience, awareness (of yourself and your dog) and common sense. Ensure your greyhound has their own bed, and discourage them from sleeping on spaces used by humans to avoid territorial issues. Some greyhounds will overcome their sleep aggression as they gain confidence as a pet, but many will always require careful management.