Estray, in common law, is any domestic animal found wandering at large or lost, particularly if its owner is unknown.
Under early English common law, estrays were forfeited to the king or lord of the manor; under modern statutes, provision is made for taking up stray animals and acquiring either title to them or a lien for the expenses incurred in keeping them.
A person taking up an estray has a qualified ownership in it, which becomes absolute if the owner fails to claim the animal within the statutory time limit.
Some statutes limit the right to take up estrays to certain classes of persons, to certain seasons or places, or to animals requiring care.
There is no strictly accurate definition of an estray to be found in any reported decision but from all of them may be deduced the following: An estray is an animal, by nature tame and reclaimable, having a value as property generally recognized by law, as a sheep, ox, hog, or horse, which is found wandering and the owner of which is unknown.