I feed a combination of raw and Acana Working dog formula. The kibble is high fat, high protien. In the winter they get alot of raw meat and fat added to it. Being a sled dog burns a ton of calories so plain kibble just doesn't cut it in the winter. This time of year they eat dramatically less and get kibble alone more often for dinner.
Kay, lamb based foods often cause runny stools. You might want to try the Nutro Chicken formula if the lamb isn't agreeing with Simba. I used to feed Nutro and the lamb always made Sleet sick, but she did well on the chicken.
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