Collars can be dangerous for pets that live in crates or which might get stuck in tree branches and that is why safety collars have been developed. There is a particular type of safety collar which is intended for both dogs and cats. Breakaway collars are especially designed to prevent the pet from choking or getting stuck because of their collar. They feature a clever design that releases quickly when a small amount of pressure is applied, such as the cat hanging from a tree branch. The clasp will release, which quickly gets the pet out of a possibly desperate situation. However, it is recommended that pets have their collar removed before sleeping in a wired crate.
The Horse Breeding Farm, Larryann C. Willis, AS Barnes & Co., New Jersey, 1973