That's what I though; I honestly was not expecting such developments to occur in any mammal's lifetime after birth.
And I'm less concerned
I've actually read that one, I asked a friend about this story, and this is what she recommended
I don't think there any terrestrial mammals that make such a change, the skeleton and musculature and nerves grow over time from infancy, but don't add
While I am sure it is not it, it does sound similar to the High Crusade by Poul Anderson.
Maybe it is one of These:
I'm surprised Amazon doesn't have more info, but you're right, it doesn't.
The Red Queen's War is a trilogy. Prince of Fools is out June