The main differences between Hill's Science Diet Small Bites and Small Paws are: Small Bites is for dogs under 20 lbs, while Small Paws is for dogs under 25 lbs, Small Bites contains gluten, but Small Paws is gluten-free, Small Bites uses chicken and pork as protein sources, Small Paws just uses chicken, Small Bites has a higher calorie density at 408 kcal/cup versus 361 kcal/cup in Small Paws, Small Bites has tinier kibble pieces tailored for toy breeds.