Hi all. We have two springer spaniels who are 12 (bit of a grumpy old man) and 4. We've just got a 10 month old cocker spaniel as a friend of a friend wasn't coping cos they though it was a small dog that wouldn't need much exercise. 
He's lovely apart from when he thinks he's done something wrong, when he then gets very snappy. He's a bit of a kleptomaniac so things are now out of reach for him. Any tips of how to deal with his snapping?