I know it sounds idiotic, but I'm worried my piggy is jealous of my other pets. Suggestions?

YOU MAY WANT TO SEPERATE THEM OR YOU CAN TRAIN THEM TO RESPECT HIM <OR HER>

Try and introduce your piggy to your other pets and see if they get along. If that doesn't work, then you give each pet an equal amount of attention each day. If you did/do that already, just keep trying until you think you got it right!