Harnesses for walks is a must. Even when they're bigger it's better than a collar. However, Kaji wears a collar for his bells and tags at all times. He's hardly completely naked because he wears his id's. I've never taken him for a walk by attaching his leash to his collar, I'd rather let him walk on his own than potentially harm his trachea. But your baby still has a while before going outside. YTers with puppies recommend to wait 2 weeks after all puppy shots are done to insure immunity against nasty infections. Don't know myself since Kaji was already one years old.
__________________ Littlest JakJak 
We miss you Kaji 
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