We use a regular leather buckle collar on Odin. For training and walking we use a gentle leader... WORKS WONDERS on PULLING. Harnesses aren't suppose to be good with the boxer breed because it assists them in PULLING... it plays into their strength. Though I know there are a few people on here that have their boxers in them. I'm looking at martingales too. I want to order one from Shaka Dog Collars but I don't have the money right now. So I'm just waiting...