We're in California. Round 2 (including as deep a cleaning as we could do inside) failed, we're now doing 7 days of ronidazole. His diarrhea got worse after we stopped the metronidazole. So now, in addition to the antibiotics, we're giving him chicken and rice instead of kibble, along with some diatomaceous earth, and new (different) probiotic powder. His poops are more solid now, but still worried that we won't clear it this round either. A lot of people say that they can learn to tolerate it (even while remaining a carrier), but my friend has a golden who has struggled with giardia and stomach problems since he was a puppy, and he's now 1 and a half.