I'll be the odd ball here and express that a dog's canines do indeed play an integral role in the act of holding. Generally, a dogs canines are for holding/anchoring, incisors for tearing, and molars for crushing bone. Can a dog catch without canines? Sure. But do canines play a large role in holding prey? Absolutely. If you look at the anatomy of the dog bite, the canines make contact first, before the dog closes his mouth completely, thus 'anchoring' the hold. Canines are there for a good reason.
im no expert but im with you. I believe a dog will hold with the rear teeth. (Whatever there called) but the canine teeth or whatever the long ones are called lol play a big part of catching a hog. I've said it before... say the hog breaks right as the cd gets there and the cd just happens to be a little faster than the hog and is able to run him/her down. I bet the dog is biting at the hog trying to get him stopped and those canines are playing a huge role in that situation.