Mine likes every juicy and sweet fruit as said but I dont need to open it so he eats them, some of them I have to do it to take out the seeds. Try banana, cherries, plum, watermelon, melon, grapes, kiwi... and if he doesnt like it try mixing it in raw egg, so he will eat it. And about how much, I give him meat once or twice a week, the rest fruits, everyday a different one. :-D