Dogs may be afraid of cats due to several reasons including past negative experiences, confusion over different body language signals, and instinctual behavior. Dogs that have had a bad encounter with a cat, such as being scratched or hissed at, can develop a lasting fear of cats. Additionally, dogs and cats communicate very differently—what is friendly in dog body language might be seen as threatening by cats, and cat defensive behaviors like staring, hissing, and swiping can intimidate dogs. Some dogs may also be naturally timid or sensitive and find a confident cat intimidating. This fear is generally less about actual fright and more about the dog’s instinct to avoid conflict or the uncertainty caused by unfamiliar feline behaviors. With proper socialization and positive interactions, most dogs can overcome their fear of cats over time.