When Belle was 5 months old, she literally snapped a choker collar trying to get to the car. We tried a pinch collar, or a discipline collar, and she still pulled. She wasn't gagging like she did with the standard choker, but I thought she would pinch her head right off. For Christmas, I got her a new harness (I know, that's like getting underwear in your stocking) and it has made a WORLD of difference. It has fleece sleeves that go under her arms, and the nylon leads run from the collar, through the sleeves, and up to the leash. I foulnd it at Wal-Mart (we have no pet stores in our area) and it's been wonderful!