Bosley is almost three yrs old. I started him on Primal beef freeze dried two days ago. He threw up a couple of hours after breakfast this morning. Would it be better to give him some kefir or goats milk. No stores in my area have goats milk, will need to drive about an hour to get it. Which isn't a problem if it'll help. I have Kefir here at home. If Kefir is ok how much? Also, is there a protein easier to digest than beef. I know I read that in a thread somewhere, but I can't find it now. Thanks for any help!