let him eat it .....hes a young dog and will grow out of it,,,,,it a natural instinct.....i had one that just ate the bunnies ears ,,,,,like i say he will grow out of it as he matures .....it deffo not unusall...it got nothing to do with him being hungry...and same for the jumping it will come...not all dogs are good natural jumpers ..steady away mate,,,,dont exspect miricals from a 9 month old pup......and defernitly dont feed him before you go out ,,,,,that will cause you some probs.....