We have a collar but we never put it on him. We have put his tag on his harness so if we are outside, he's always in his harness, and always has his tag on. Do not have his rabies tag yet but we'll probably put that on his harness also. He hasn't been bolting out the door or anything so hopefully it'll stay that way. I hate putting a collar on him. He seems so uncomfortable. For us it's rough to even find a collar to fit him let alone be comfortable as well.