Layla is going through the same thing right now! she is loosing her teeth about one every other day. she has lost interest in eating and if i feed her by hand i can get her to eat a bit. however she has not lost interest in her treats
so she has been getting a few more than normal lately. I wouldn't change his food because then you'll just upset his tummy too. one problem at a time
i emailed my breeder about the teething and she said eating less than normal was to be expected. I went to PetSmart and got Layla puppy freezies which she LOVES and that way i know she is getting some fluids at least. She also threw up a couple times.. not a lot.. as there wasn't much in her tummy. Not sure if this helped.. but i know it is nice to know you arne't the only one going through something