From the way you describe it and the photos Im inclined to beleive it is a musculoskeletal injury from breeding. The fact that continuous motion eventually straightens the tail back out almost to its normal place of rest and then stopping results in the "s" shape returning makes me think stressed/strained ligament, tendon, and/or muscle. If it has something to do with bone you can listen for crepitation which is the sound of bone on bone that shouldn't be touching(simple or complex fracture) or (stress fracture from over exerction: very small typically and dont always show up on x-ray). It will be faint due to the size of the bones but if its there you will hear it. Im not a vet, but i do have some decent experience with mechanisms of injury and musculoskeletal injuries. (marines love to do crazy/stupid stuff and then i have to fix em) lol
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