Hello,
I recommend checking the "Walkthru Videos" from above, last video (from xvideo) at 21:01, to check if the bunny taming is done correctly, aswell as the follow action via h cancel (0).
P.S.: In case of not certain about the taming procedure you can always check a short video of it in [TAB] Fapestiary, on the left page of the fapet under it's poster.
Side note: as @MartPriest have stated, if nothing helps, try restarting the game (although this option is mostly applicable for long extensive gameplay)
I hope this helps,
Cheers