Amy, it's very hard to detect in dogs (and people) so even if you've had a fecal done on him in the last few months that was clear, you may consider treating him for giardia. I don't know if you remember, but Chester had several bouts of diarrhea and was treated for it. Since then we haven't had a single case of it around here. We didn't know if the girls had it or not, but our vet said the medication wouldn't hurt them if they didn't have it, so we dosed them at the same time as Chester.

It's not an expensive medication at all. It's called metronidazole.

I hope poor Nebo feels better soon!