A starving dog might bite your hand if you were near his food. This behavior is based on what needs.
Physiological -or- Emotional
I would definitely say physiological, because food is a necessity for the body to survive. If the dog is starving, he will need the food, so he will therefore protect it. However, things like affection are emotional needs, such as Harlow’s monkeys. So you see the difference – he needs the food to survive, so it is a biological (I.e physiological) need.
Hope this helps! XSource(s): Psychology student