Our Daisy had something the weekend of my mom's funeral, diarrhea for 4 days.   I found a rabbit she had killed in the backyard and thought she might have gotten something from eating part of it.  Took her to the vet and they said she would be fine with time and fluids.  Now Dexter has had something similar for 2 days.  (Boy am I tired of cleaning up poop.)  But his appetite is still good and he's not too lethargic, so I'm hoping it is not this virus but something milder.