I feed mostly RAW. Maybe three to five days a month is kibble based on work schedule. There is no science here just an observation. The last few dogs we have raised on raw has had considerable more mouth than their brothers and sisters. Like no matter which pup I had form the litter it seemed to bite harder. This may be a question for those more in the know but here is my thoughts. Ever seen a guy that turns wrenches for a living even if he is not muscled up his forearms and hand strength is quite strong. A guy that bales hay, loads it manually for a life time may be thin and wiry but cock diesel none the less. My uncle could roll under a 350 transmission, press it up off his chest and land it on the dial pins, keep it in place and get a bolt started. Put him on a weight bench and he would struggle with 135lbs. Odd but true. On the dog side, if a dog started really having to chew and work his food, like backs and necks, and quarters and shanks, over a life time would those muscles be better equipped than the dog who eats kibble where the amount of chewing is miniscule in comparison. We split a lot of our litters amongst ourselves and for last little while it seems my dogs are having more mouth than their litter mates. And a lot of times I let everyone else pick first and I end up with what is left.
I have always believed mouth can't be created but this at least has me thinking. EWO