I want to offer my experience to this topic. We rescued our grey Max back in Feb 2018. The rescue we got him from uses a prison program as well. We are in the Central Ohio area. We were unaware of any hook issues when we adopted, and based on Max's history and the fact that he was fostered around other greys we didn't think there would be any issues. When we decided to enroll him into a blood donation program associated with the vet clinic we use, we were made aware that his bloodwork indicated he could have a possible infestation. So, we had a fecal test, and sure enough he was positive for hooks. The recommended course of treatment is:
first of month - Advantage Multi
15th of month - Panacur + nexgard for ticks
repeat until clear at least 2 months (with fecal tests).
We were warned that it may take anywhere from a year or longer to rid him of hooks completely, but hopefully after the 3rd round he will be healthy enough to begin donating blood. We will be getting another blood work up Mid June to confirm.
As far as administering the treatment - I hate the Advantage Multi, but after 3 times I've gotten good at applying. We mix the panacur powder in with wet food and he tolerates it well. We follow up with the nexgard as a treat a couple hours later. We have just completed the third full round of treatment (mar, apr, may). After the Advantage Multi, his stools get looser than usual for a few days, but after the third round of Advantage Multi, Max had very soupy/splashy stools about 2 days later. Concerned, we took another stool sample in to rule out anything else. He was still showing 100+ eggs in his stool but the vet didn't think anything else was going on since his appetite and activity were normal. We treated the loose stool with cooked quick oats mixed in with his kibble, and have switched to pumpkin. His stools have returned to 'normal' oatmeal consistency and his appetite continues to be fine. He eats 2 times a day of dry kibble, with some pumpkin puree and probiotic mixed in for dinner. His weight dropped a litte from 72 to 69, eventhough he gets the reccommended servings, so the vet recommended slight overfeeding - and he was back up to 71 1/2 as of March-end. He does look like he has gained a bit more as his whole rib case no longer shows. He looks healthy!
One other thing to note - I contacted our rescue and advised them of the situation with the hooks, and they are aware that most of the dogs they get now are turning out to be infested with hooks. They are considering beginning the above protocal on all new rescues, but I don't know when they will finalize that decision. They are genuinely concerned about the situation, so I believe they will do the right thing for the animals.
I will post updates on Max's progress through this. I am hopeful that he will be cleared in the next few months.