4 month old Newfoundland
After playing a great game of catch with my 4 month old Newfoundland puppy, he lay down to rest. I got the clue that he was tired and sat down a few feet away from him facing away. A second later he got up and jumped on me scratching my face. I didn't see him coming. So I got up and headed for the house. He continued jumping on me and biting my legs. I simply walked in the house and left him outside. How should I handle this type of situation in the future. I want him to stop jumping and biting me.