I just added insulation to my '07 and used kits from Quiet Ride.
Here's a link:
http://www.quietride.com/acoustishield.html
I installed the Floor Insulation and the Engine Cover Kits. These are totally complete kits with everything needed except very basic hand tools. The installation took most of one day and was really pretty easy. Hardest part was lifting out the heavy front seats
(Don't forget to deactivate the air bags!!!) The difference in noise while driving is VERY noticable. My dog house never really got hot, so that wasn't a concern, but these kits definately quieted things down. I would do it again in a heartbeat. If you've got an oil burner, go for it!!