Thanks for the replies, I appreciate it. I'd like to make socks that he can wear with shoes as well so I don't thing the gripper stuff would work for that but I was also wondering where I could get a non slip bottom for slippers so Thanks a bunch for that. I had no idea where I would get that. I'm thinking I may try the fabric paint, it seems that would be most like what is on his store bought socks and that works pretty good for keeping him "on his toes".
I just didn't know if thats what it was of if it was something more specific to the application.