Troubles with Indik. Again:(

A week ago, Indik had an operation. He had a tumor removed from his muzzle. Everything went well, but yesterday he refused to eat: (Now we are sitting in the waiting room of a veterinarian and waiting for our turn.Sometimes it seems to me that dog illnesses never end ... I, of course, understand that this only seems so, because we we have many dogs and someone inevitably gets sick, but it's so terrible when the pets get sick ... I hope the veterinarian will figure out what is the reason for Indick's poor health.