My vet suggested using diluted bleach wipes on his butthole. Sounds harsh, it was like a 99percent ratio of water. I used the dilited bleach wipes to clean up any surface area too. Bleach is the only thing that kills the giardia.
To firm up his poop, I gave my pup perfect form. Really helped firm up his poo
The Honest Kitchen Perfect Form Herbal Supplement, 5.5-Ounce https://www.amazon.com/dp/B00A8O1V74/ref=cm_sw_r_cp_apa_kXZ8xbQ08CXG6
I've heard good things about this natural remedy for giardia, but did not need to use it myself
Amber Technology Kochi Free, 1 oz https://www.amazon.com/dp/B002MV9UDS/ref=cm_sw_r_cp_apa_CYZ8xb2GQ6P30