Just out of curiosity, why are you grinding the chicken for the dogs? I feed my dog and cats raw and don't grind, even my smallest cat when she was a 4 pound kitten could shear through a chicken leg bone like it wasn't there, the dog has even less trouble than the cats and he's a little 13 pound chaweenie so he's not huge either. Also, I don't know how important taurine is to dogs, I know it is pretty important to cats... taurine is damaged by exposure to the air, so the smaller you cut up the meat, the more surface area and the more taurine is damaged and removed from the meat. I actually got a grinder for the cats and dog, but I've only used it like once for them because I read that about the taurine and it just wasn't worth it to me to have to worry about burning the motor out on the bones or having to sit there and cut all the meat off the bone before grinding.
Two reasons...... one is portion control, I have four dogs, who get a variety of meat and organs each day- five pounds amongst them. It's a race to get all the food down so unfortunately my dogs don't believe in chewing much. I buy chicken leg quarters that come from spent meatie breeders from my raw food supplier, they are about a pound apiece. Huge things. I've just found it easier to mix and match various meats/eggs/veggies and they get 21/2 pounds of chicken a day with other stuff, between all of them, it's easier to measure ground. The other reason........ one of my dogs won't eat whole raw chicken :/ she's grossed out by the skin. Did I mention these are sled dogs??? Geez you'd think they would eat anything.
I did not know that about grinding and the taurine, I grind and freeze immediately hopefully that helps. They do get whole turkey neck a couple of times a week, whole mackerel and whole organs like pork tongue and heart as part of their diet.
I have a Weston 22 grinder, grinds through those chicken leg bones and all in no time flat.
My fussy cat will not touch raw. :/ She doesn't like canned food, only kibble

(I feed Orijen but I wish she'd eat raw). At least she prefers her diet of chipmunk and squirrel, can't be bothered to eat mice. Oh yeah she also likes layer pellets

which I know can't be good for her, but at least she's stopped eating those lately.....Cats! Drive you nuts.