Head halters are an alternative to collars that works similarly to a horse halter. The halter fits over the dog's snout and behind its head (leading it to sometimes be mistaken for a muzzle). Halters reduce the dog's ability to successfully pull on the leash, but do not eliminate it. If the halter is used with a sharp jerk on the leash, neck injury to the dog may result, but used correctly head halters have not been shown to cause harm.
Feed your dog a high-quality diet with appropriate amounts of protein. If your dog spends most of his days lounging in your condo, don’t feed him food with a protein level that is ideal for dogs who herd sheep all day. The money that you will spend on feeding an appropriate quality food will often be money that you save in vet bills later on. I recommend you always check with your veterinarian for the right diet for your dog.