My mare also rubs the top of her tail off. She has done so since she was a baby. I had a fecal done - negative. I clean her udders and between her back legs almost every day. For those who said use a flea/tick shampoo on the tailbone - how often did you use it?. That is definitely where she is itchy. If I scratch gently under the tailbone (near her girly bits), she nose stretches out about a mile.
Have you tried apple cider vinegar in a 50/50 solution? It has anti fungal and antiseptic properties. Just donāt use it on open skin.
I do baby wipes, face wipes, pet wipes on my girls teets - whatever is handy. I also get under her tail with them and any crust that built up around her vulva. Then I mix listerine (yellow/original) with sweet almond oil, and a few drops of lavender. Probably 50/50 on the listerine / oil. Listerine dries, the oil moisturizes. Some suggest baby oil, but I donāt like it for a variety of reasons. I spray her tail bone. Then I use my hand and rub some between her teets too. Itās helped significantly with the build up and crust. It comes off much easier. I clean and reapply every few days.
The ivermectin in and around the anus is for pinworms, which cause horrible itching. BTDT and that took care of it. With pinworms youāll likely see a yellowish āpowderā around the anus which I think is the pinworm eggs.
Iām betting it is pinworms. Ivermectin didnāt work on them. I tried Quest plus and that didnāt help either. Fenbendazole seems to work best on pinworms. It is probably time to repeat treatment as Iāve noticed some of my horses have some hair loss. It seems to be a summer problem.
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Iād definitely start with a good wormer and rotate them throughout the year. My barn rotates through 3 different ones.
When my gelding starts itching his tail, it is usually because of ticks. Iāve never found any ticks on him, just tons of tick bites. When it gets bad, I scrub his tail with betadine everyday for a week and put vetricyn on the really bad ones. After it is under control, I scrub his tail once week with betadine. I also make sure his tail is well conditioned so it is not full of flaky dandruff. Out of the 26 horses at the barn, it is only my gelding who has this problem and he is always negative for Lyme. Iāve also tried fly sprays that say they repel ticks, but I donāt believe they actually work.