Ripley does because if givin the chance he will be off lol Perky does, well I am not sure why she does exactly she just always has. Blair does now its usfull for grabbing him if need be lol before his haircut though he did not because you could not find his collar under all that hair anyway. Happy almost never wears a collar, although she is currently wearing a gold chain, not a slip collar but just a gold link chain as a collar, and just because its pretty lol Misty sometimes she does and sometimes she does'nt but she normally does, so we can grab her collar if she is being a grumpy puss lol when we had shadow she always wore a collar exept when she took it off herself lol, now she still always wears her collar, but she recently got a new one that she cant get off.