Pets, like dogs and cats, can develop separation anxiety for various reasons. Some common factors that contribute to separation anxiety in pets include past traumatic experiences, lack of proper socialization, changes in routine or environment, and genetic predisposition. Additionally, pets that are particularly attached to their owners or have experienced sudden or frequent separations may be more prone to developing separation anxiety. It's essential to address the underlying causes and work with a veterinarian or animal behaviorist to help alleviate separation anxiety in pets.