I know im just a newbie to the site and the whole process, but this is what we experienced with Puppy. I dont know what pain meds Winston is on, but when Puppy was on the Rimadyl and Tramadol he wounldnt eat or sleep and was acting a little bizarre (panting, restless, confused). I called the vet and he said that was probably a reaction to the Tramadol which I see in the forums is pretty consistent. The vet said to try just the Rimadyl. Once he was off the Tramadol his stomach awoke to new heights of hunger!! Also, did not seem to be in any pain. Obviously I would call the Vet before I did this though. Wishing Winston the best.

Feed things that are warm and smelly, and give them by hand.

My dog ate a bit right after his amputation, then his appetite dwindled. The day before his first chemo treatment he was finally hungry enough to eat from his bowl, and the Carboplatin only seems to have made him hungrier.

To get him eating, I made cooked him his own gravy. I roasted a chicken, pulled some of the meat off for sandwiches, and cooked the rest in a pot with water and veggies (no garlic or onions or seasoning). When it was done I put it in the fridge overnight so I could skim off the excess fat, removed all the bones, and then put the whole thing in the blender. If I warmed it up in the microwave and mixed it with his kibble, he'd eat it (or at least lick up the gravy) and it made enough to freeze some if I ever need it.

But like people have already said--he mostly just needed a little time.