I use Safeguard for non-specific problems that keep the rabbits out of condition for long lengths of time (>2 weeks) with no apparent cause - which could certainly be related to intestinal parasites. When I've dealt with these episodes of mysterious struggle to reach/keep prime condition, fenbendazole usually does the trick. The typically-recommended pea-sized amount of fenbendazole is appropriate for a typical meat rabbit (7-10lbs), and I've given Mini Rex (3-4.5lbs) half-pea-sized doses, so at 4.5 - 6.5lbs, a mini lop should be fine with a "small pea." Safeguard is apparetly available as a 10% suspension liquid for goats, but this is the paste formulation I have used successfully with my rabbits for about 2 decades:
View attachment 35878
I squirt it into their mouths, or if they reject that, smear it on their lips and inside their front legs, where they'll ingest it while cleaning themselves up.
I've watched several videos like the one above about the paste wormers, but I've used the apple-flavored 1.87% ivermectin horse paste for a similar length of time (ca. 20 years) and have yet to see a problem. I've only used the ivermectin for fur mites in adult rabbits, but it has never failed to solve that issue.
View attachment 35879
I consider ivermectin an extremely safe medication; dosage can vary quite widely before you see overdose pathology. According to the WHO, in their 1994 report about ivermectin, as reported in INCHEM.org
, (WHO’s website for “Internationally Peer Reviewed Chemical Safety Information”) in mammals the margin of error for invermectin overdose is quite large:
Section 7.2.2 Collie dogs have been shown to be more sensitive than other dogs to the toxic effects of ivermectin. Depression, tremors, mydriasis, ataxia, coma and death have been seen in Collie dogs at 100 ðg/kg orally and greater, but not at the recommended dose of the commercial product (6 ðg/kg) (Campbell & Benz, 1984).
Since I will not give my rabbits anything I will not eat myself (they are meat rabbits after all), there is further interesting and reassuring information about human toxicity from the same publication - INCHEM.org
Section 7.2.1 Human Data.