i just adopted a male cockerspaniel a year ago. his name is marty and he is very loving! there is only one problem, he'll never play with any of his toys! i have tried bouncy balls and tnnise balls,squeeky toys hard toys and stuffed toys and he will never play with any of them! marty will only grab them and bring them back to me for food and then he will forget that the toys are still there! i have no idea what to do.