noun
owning multiple animals (esp. pets of the same kind)
Commonly used in contexts of pet ownership, especially dogs or cats, where a person keeps more than one animal of the same species.
多頭飼いをしていると、ペット同士の相性が大切です。
When you own multiple pets, compatibility between them is important.
猫の多頭飼いには広いスペースが必要だ。
Keeping multiple cats requires a large space.
Compound of 多頭 (many heads, i.e., many animals) and 飼い (keeping, raising).