Testicles cannot be withdrawn into the abdomen after the inguinal ring closes - typically within a few days of foaling at the latest. Hence, if the testicles were descended as a weanling, they are still descended, so if you are sure that they were the testicles that were palpated at that point, they are still there. In some cases, it may be necessary to have your vet lay the horse down in order to palpate them, and you should do that and absolutely confirm testicular absence prior to treatment with hCG.
Roz, I had a colt as a 2 yr old that I had never seen testicles on....I had 2 vets tell me that if he hasn't dropped by 2 yrs old, he probably won't. They both told me to get rid of him and get "a real stallion". I put him on the market and the day I sold him, he dropped, and there they were plain as day! Of course, I had to disappoint the buyer, but don't be put off that he hasn't dropped yet. The vets who checked mine would not lay him down (though I had mentioned this procedure to them)...and they both gave it a good feel and said, "This horse isn't even inguinal...they're NOT there anywhere, he's abdominal and will never drop." If only they had laid him down, maybe they would have figured it out. He is my primary breeding stallion this year, has both testicles, both of normal size, and all his mares are in foal. Good luck with your boy....seek multiple opinions....
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