The vet called with the results of his blood work- oddly enough, he does not have a bacterial infection as she thought (from the gelding) - so she is guessing that he got some other virus - perhaps because he was a little more vulnerable after having surgery. If the fever doesn't go completely away in the next day or two she'll want to come recheck him.
Luigi is being a very understanding brother- he just wants his perky playmate back!
St. Francis blesses Paco's meds!