Why use a collar: the dog on the harness is straining to pull away, but it doesn’t feel unpleasant. He isn’t concerned when your leash twitches.
The harness keeps the dog’s head down, not high, and its neck output is incorrect. Jack Russells’ backs frequently begin to fall off as a result of an incorrect distribution of weight.
If the dog has free elbows, the harness will irritate and possibly enrage them. A herringbone collar (expanding) or normal nylon/leather collar is ideal.
A narrow collar may be used on puppies during the training and has a more powerful impact. You should utilize conventional nylon collars with metal buckles and carbines. They’re quick to put on and remove.
Soft wide collars are half-sleeves, which do not damage the wool and are simple to remove and care for. Adult dogs with heads should wear half-sleeves since these collars are tailored to the size of the particular dog and aren’t restricted. After performing certain procedures, “prescribe” a harness.