We have had our 9 week old gsd puppy for a bit over a week now. We started to feed Taste of the wild immediately. He was not eating this though before. Breeder vaguely mentioned 4 grain puppy food and boiled chicken. I do not know how much or how often the chicken was given. I also boiled some chicken and fed him for 3 nights maybe 2 ounces boiled chicken and some kibble only at his meal time. Big question is... I heard taste of the wild is great food. He does love to eat it so far!! But... his poop has been firm and good but then it gets mushy and almost runny on and off. Why!!!! Is this just him adjusting to the food ?? Maybe his stomach is just still maturing since he is only 9 weeks?? Any ideas or pointers I would really appreciate. I just don't understand the firm poop and then runny poop.