Chihuahua
Chihuahuas, despite their small size, can be dangerous due to the territorial and protective nature of these dogs. These small dogs can develop a close bond with their owners, and become possessive. This can lead to aggressive behavior. Chihuahuas are known to bite or attack humans and animals, particularly if they feel anxious or threatened.
It is important to recognize their aggression potential and to ensure that they are properly trained and socialized to avoid any negative incidents.