Hey all, I've been battling roundworms with Flash... we had a fecal done last summer and he showed a low count of roundworms and small strongyls. He had been wormed every 3 months last spring/summer rotating ingredients before we did the fecal so I was a little upset to see that he still in fact an egg count.... After the fecal which was mid summer My vet had me do a double dose of fenbendazole and then we did Quest Plus in the fall. I should have done another fecal afterwards but I figured that would have done the trick. Mid March I happened to notice something hanging out of his bum, removed it and it was a good 12" roundworm, ICK! Messaged my vet right away and I treated with Ivermectin the next day. Had a fecal done with vaccines now and the results came back that he STILL has a low count of roundworm eggs! My vet thinks we should do another double dose of fenbendazole in 3 weeks and fecal again in July. I'm a bit at a loss. I'm thinking at this point the roundworms have built up an immunity to the wormer... and I'm also worried as to why Flash hasn't built up an immunity to the roundworms yet... I'm located in Ontario, Canada so I'm not sure if we can get powerpacks or anything like that - at least I haven't seen any in our local feedstores.... Any help would be GREATLY appreciated.