Anecdotal: Not GP. I don't remember where I read it about wild animals, but my dog would have the occasional "low energy, don't want to play" day, followed by

Anecdotal: Not GP. I don't remember where I read it about wild animals, but my dog would have the occasional "low energy, don't want to play" day, followed by a couple of days of not eating, and then being super-energetic when he went back to eating. On one of these occasions, I took him to the vet, who said he had a fever, likely of viral cause, and that him losing appetite was perfectly natural and likely helping him heal. When I'm sick I lose my appetite (and don't eat, sometimes for a few days). Don't you lose your appetite when you are sick?