Having done earthwork with terriers that had missing teeth, broken teeth, undershot, overbite, level, etc I can only say the heart of the dog will tell you how functional it's bite is.
I once dug to a terrier/Dasch that had been missing it's lower canines and all of it's incisors for a number of years. It was still one hell of a worker in the ground.
Even undershot flat faced Shih-tzus have a VERY "functional" bite! And they're the hardest to muzzle. Go figure....oh wait no its pugs! LOL Temperament always wins I think.
OK but seriously...I dunno I guess it depends on what the dog has to do. The original bite is the scissors bite....why level is preferred I'll never know? The wolf has a scissors bite.
A tired dog is a good dog, a trained dog is a better dog.
I think there are a lot of potential problems waiting to happen when the bite isnt scissor. I was just reading "Structure in Action" and it explains that when the bite isnt scissor, the teeth may grow crooked or into the palate or a number of other problems that increases the risk of periodontal disease. I think if health and longevity are considered an element of functionality in this question then a scissor bite would be the most functional. JMO.
It's interesting, this weekend we had occasion to meet two beautiful german shepherds, both registered working lines to boot.
Bob mentioned with the first dog, after the owner had left, did you notice how short her muzzle was? I hadn't but when we met the second dog, he pointed out the same thing, discretely.
Our two younger ones are large dogs with scissor bites (well the older husky too but much smaller) and compared to other dogs, they seem to have these huge mouths.
We've been watching American Idol and had a couple of laughs at Steven Tyler's expense, comparing his mouth to Vince's in the dog world and what a great singer Vince would make if a huge mouth was one of the determining factors.
I know nothing about the funtionality of these bites only that the teeth are quite sharp and have an ability to come down incredibly hard when that's their intent.
I was thinking a scissor bite is most natural, I started checking into the genes behind the bite, and I'll stick to the functional part ( top and bottom controlled seperate, 16 or so for each)
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