Has anything led up to him not eating: injured, acting ill, vomiting/diarrhea, emotional/mental, ate something he shouldn't have, something stuck in throat, etc.? Is he an adult or puppy? If you know 110% positively that nothing above is even remotely a possibility then it's ok to try and get him to eat the dry mixed with the wet food, or what might be a little better is fry 100% ground chuck or ground turkey and mix with cooked rice, or chicken broth with cooked rice. BUT if you have even the slightest doubt that something just might be wrong, then please take him to the vet to be checked. Hope this helped.