During the time when I had several cats, I had a favorite but I always made it a point not to show them that. I would cuddle each cat a few minutes at a time. Some of my cats didn't like cuddling though. What I would do is sneak my favorite cat inside the house and I would play with her all day in my room. I know that it must be silly to think that the others might become jealous. For all I knew, they probably didn't care. But I was careful in giving them equal time so just in case they could tell, they wouldn't feel bad. Jealousy in dogs are more obvious. When I was playing with one of them, the other would always try to jump right in my arms so he could be played with too. I would always make sure to throw two toys when we played fetch so the one who was not able to get the first one could get the second one and not feel bad.