noun
fierce dog; savage dog
Describes a dog that is aggressive, dangerous, or likely to attack. Often used in warnings or descriptions of guard dogs.
この家には猛犬がいるので、気をつけてください。
There is a fierce dog at this house, so please be careful.
猛犬注意の看板が門にかかっていた。
A 'Beware of Dog' sign was hanging on the gate.