Mine only wear collars when they leave the property.

My dogs are perimeter trained, and would far rather lay on the couch than go looking for trouble.

They are both tattooed and chipped as well.

My cat is tattooed, but if he goes missing you can rest assured it means he's become a coyote or owl snack.

http://images.yuku.com/image/gif/65d269e3f5844c51cf256773072659fc11e4f64a.gif