My dog is 3 year old pitbull, dalmation, boxer mix and lately I have noticed that after he eats he seems to be in pain on both his sides like by the hip in like the tuck of the stomach on his sides. After eating he will silently whine if you know what I mean like I can barely hear him whining and if I touch him in them spots on his side just barely touch it he goes crazy and starts biting the blanket he also likes to lay on his back after eating and have me rub his tummy but I noticed awhile back he use to do this also then like it seemed to go away for awhile or I just didn't notice it but now I noticed he is doing it again does anyone have any idea what could be wrong with him he seems to only do this after eating?