So, my dog loved his first bully stick. He chewed for about 15 minutes strait (a record for his attention span ) and then he threw up. He has a very sensitive tummy. The vet says it's nerves since he is a rescue. I am very careful to feed him sensitive tummy food, and he gets pretty bland treats, but I love that he was so intent on chewing on his bully stick (and not me)...any ideas for bully stick alternatives?