I noticed two black wilds with significant hair loss on head and back. I’ve been reading many posts about this and have a question. Since I don’t have a pet or a vet, it seems ivermectin is the only option. When I look to purchase this on line, most of what I see is for horses. Would this be the correct one to get? I feed so many every day and really would like to help them if I can. I understand dosing is crucial and will do exactly what is recommended. I will try to get pictures later, but really need to know the exact one to buy.