Has anyone’s dog tested positive for giardia (in Hawaii)?

My dog has had recurrent watery diarrhea and vomiting since the second week of February. Her fecal tests all come back good. We’ve done bland diet and two rounds of antibiotics, but every time we finish them the diarrhea comes back in full force.

We just switched to Dr. Hills prescription dog food and it worked well at first, but after a few days all symptoms have returned.

I’ve been doing research and it sounds like it could be giardia, but I’ve never heard of any cases locally. I asked my vet if our dog was tested for it previously and they said no, so going to drop off some doo doo in the morning and requesting a test. Wondering if it isn’t that common here and that’s why they never tested for it?

We live in an area with a lot of chickens running around and people who sadly don’t pick up after their dogs.

Any tips would be appreciated. Mahalo in advance!