Hard Mated (Shifters Unbound #3.5) by Jennifer Ashley
Series: Shifters Unbound.
Approx. 49,880 words.
Published on August 20, 2012.
Spike, the champion wildcat fighter of Shiftertown, is astonished to discover he's fathered a cub. Myka, the sassy horse trainer who brings him the news isn't sure Spike will make the best dad in the world, and sparks fly when she decides to keep an eye on him and his cub.