Growling

A low vibrating sound directed against someone or something. The mouth may be open and the nose wrinkled.
(Eisfeld 1966; Fox, 1971; Zimen 1971, Althaus 1982; van den Berg et al., 2003)

The Greater Swiss Mountain Dog is growling at an unfamiliar person.

VIDEO

large screen
The two 40-day-old Pit Bull Terriers are brothers, possibly the offspring of different fathers. The puppy with the brindle colour pattern has a bone, and ignores the black puppy when it approaches. The black puppy lies down, then moves nearer. The brindle puppy begins to growl and stare, while the black puppy lies down, then moves away.

growl_bark < > hackle_bite