In 3.1.1 this will be changed to 50/100% to heal 15% of your pet. Posted on mmo-champion.com, although they are unofficial.
That is a real shame. I am having little trouble keeping my FG alive up to Thorim at least, and I always run Soul Link. If the healing is cut in half with 2/2 Fel Synergy that may no longer be the case.