OH DEAR, Karen, I am sorry to hear that playtime didnt go very well this time.
I am sure its a territorial thing, maybe they should play at a park, outdoors, but on a leash w/harness, so if this happens again, you can seperate the playmates, without getting your limbs bitten.
Puppy class may help, I am sure the trainer would know how to handle this issue.
I hope you washed your hand well, after being biten, also Neosporin ointment will help with the healing, you can purchase it over the counter at any pharmacy.
Good luck, and dont give up, I am sure Rocky had a reason for his behavior.
Scratchies to all the babies from...
Chelsea'sMOM