Yes, pets can feel jealousy or envy to some extent. They may exhibit behaviors such as trying to get in between their owner and another pet, acting out or becoming aggressive when attention is given to another animal, or even displaying signs of distress when feeling left out. However, it's important to note that pets do not experience emotions in the same way humans do, so their jealousy or envy may be more about seeking attention or resources rather than actual emotions of jealousy or envy.