Some rabbit's also have reserved testicles (not sure what the technical term is) where they will never drop. My Dunkin had this. We saw he had a penis, but no testicles? It made everything very confusing. He was well past the age they would usually drop, if I'm remembering correctly he was around 9 months old when we finally just took him in. It made the surgery more invasive, similar to a spay, but he recovered without any problems. Not long after his surgery we had a male rabbit come into the rescue I volunteer at with the same problem.
The vet was unsure what kind of complications later in life a bunny with reversed testicles may encounter, or why they don't drop. But she agreed neutering was the best thing to do, that way I wouldn't have to worry about health complications later.
This is just something to look into if they continue to show no sign of dropping. The testicles descend usually around 3-1/2 months old, but many veterinarians like to wait until they reach 5 months of age. So your boy should be ready to go. With females is when the veterinarians recommend waiting until 6 months. [size="-1"]
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