Joey loves Bully sticks and they are a great chewing stick because they are 100% digestible, I don't know any other stick that is. Greenies, and rawhides, both have small parts that are not 100% digestible. I use to take the sticks away when they were small, but Joey's not a gulper, and has never tried to swallow a big piece. You should watch how you dogs chew the stick, and you'll get to know his pattern. I use the Merrick brand, they are really hard, and it takes a whole week for Joey to chew on stick. When he was a puppy, he would go nuts looking for a place to hide it, and pretend bury it, and start the process all over. By the way, it's made from the penis, not the testicles.
