The price I got $78 for 2 x 12 month supply was for the Heartguard Plus, up to 25 lbs, that comes in the blue box. Will be sure to check the expiration dates - thanks for the tip! You also get a $5 off coupon for a next purchase.
Your dog suffered a similar injury, although not from ppoping, but that agrivated it.
We had him on similar meds and it has been about a month now and he seems fine. No damage to his spine.
Hope all goes well with your little Jet!