This is so cool. Apparently Tenacity pets specced correctly can in the right situation increase Holy Pally Healing of Valithria by 40%. Check this out from warcrafthuntersunion.com

Healing Valithria

Okay, so I promised there was a way you could help heal Valithria -- and no, it has nothing to do with breaking out the Heavy Frostweave Bandages (though there's a mage in my raid who likes to spend his time between mobs doing just that). However, you will need to have a holy paladin healing Valithria.

Not every 10-man will have a holy paladin, but almost every 25-man will. And if you have a holy paladin in the raid, they're almost certainly going to be on Valithria healing duty. Holy pallies have the highest single-target HPS spell in the game in the form of Holy Light. They also have the Glyph of Holy Light, which causes their Holy Light spell to splash heal everyone around them. So the typical pally healing strategy is for the paladin to heal themselves with Beacon of Light on Valithria, thus healing Valithria for the Holy Light and the glyph splash healing -- and that splash healing adds up to a huge amount of healing.

This is where we come in. Or more specifically, our pets.

Our tenacity pets have a talent in their tenacity tree, Blood of the Rhino, that increases healing effects by 40%. This healing increase will not transfer over via Beacon; however, it will increase the splash healing from their glyph effect, and that glyph effect can account for up to 30% of a holy paladin's effective healing on Valithria.

So instead of your wolf, bring your favorite tenacity pet along, and make sure they have both ranks of Blood of the Rhino. Put the pet on passive and at the beginning of the fight walk your pet over to Valithria and put it on stay. It's vital that your pet is within 8 yards of Valithria -- you can park it inside of Valithria herself to be on the safe side. Then have your pally heal your pet with beacon on Valithria. Now all that splash healing will heal for 40% more. So while you're off burning down adds, your pet is camped in the center lending it's 40% healing buff to all those massive Holy Light splash heals.

That's right -- it's a fight where your pet will actually get heals!"