Euthanasia (Greek, "good death") is the practice of killing a human or other animal, in a painless or minimally painful way, for merciful reasons, usually to end suffering. This article discusses non-human animal euthanasia; a separate article covers euthanasia in humans.
An animal is euthanized when it is killed in a manner deemed to be humane, and in the case of a pet, in accordance with the emotional needs of the owner. This process is commonly referred to by the euphemism "put to sleep".
Communication is the process of exchanging information, usually via common system of symbols. It takes a wide variety of forms, from two people having a face-to-face conversation, to hand signals, to messages sent over global telecommunication networks. The process of communication is what allows us to interact with other people; without it, we would be unable to share knowledge or experiences with anything outside of ourselves. Common forms of communication include speaking, writing, gestures, and broadcasting.
A muzzled German Shepherd.
A muzzle is a device that is placed over the snout of an animal to keep it from biting or otherwise opening its mouth.
In the animal breeding, to breed true means that specimens of an animal breed will breed true-to-type when mated like-to like; that is, that the progeny of any two individuals in the same breed will show consistent, replicable and predictable characteristics. A puppy from two purebred dogs of the same breed, for example, will exhibit the traits of its parents, and not the traits of all breeds in the subject breed's ancestry.