We've got some Staffies, and they're beautiful, loyal dogs but always headstrong and "mad"!!! The one you have is still a baby, and will want to chew on things to help his mature teeth to come through. Has he got lots of toys? As he gets older, you'll need something like nylon bones, otherwise he'll just blitz everything. Ours can make easy work of a large Kong in about 20 minutes! Try not to feed titbits by hand unless your puppy takes them nicely. If you use a stern voice, he'll soon learn that if he's good, he'll be rewarded. He's still very young yet though - and all puppies chew and bite!