Cats and dogs

Cats are pretty picky and dogs are jealous. Today I had to take Simba and Toby(dogs) to bed. They were unhappy to see Meow-meow(the spoilt cat) eat from their dish. I think Jack left the dog food on the floor. And Meow-meow was happily munching on it. So when I took the dogs to bed, I thought Simba won't give me any trouble. She went to garage and Toby ran around in the house. While I was trying to get hold of Toby, Simba changed her mind and came to the kitchen and ate all the cat food. Toby didn't care much about going to bed, after he had one of the cat food container. Once Toby was in the garage, I was wondering where is Simba. I had to wait all the time while Simba munched on. I didn't want to disturb a hungry dog.
A little while later, I took food to both dogs and cats and all four of them seemed not to be hungry at all! I am now trying to understand this behaviour. It seems to me, that even humans behave that way. Sometimes when someone else takes the position one wants, then they have an icy cold treatment towards the other person. I think as higher level animals we should show much better behaviour.