Will Falconer, DVM Moderator
Poor guy, Betty! I'd be willing to bet, if you looked a week or two prior to him getting Giardia, he likely got parvo vaccination (along with about 4 others in the same syringe). That's known to be immune suppressive, and the Giardia took over. If it isn't Giardia, it's often Coronavirus, but same scenario. Then come the drugs that carpet bomb the gut, killing good flora along with Giardia, further impairing his immune system. Enter demodex, the mite that can only grow when there's an immune deficiency. And you'll get a postcard for more shots before too long!
100% manmade disease, and in the name of "prevention!"
None of this can be helped with "quick tips" over comments like this. It'll take hiring a homeopathic vet and some months of work, likely, to get him well. But here's the good news: if you work this way, carefully, and step out of the medical paradigm he started in, you can cure him.
I wish you all the best. Thanks for sharing this all too common and sad tale of damage from conventional medicine with us.