yes, yes to the safe* heartworm preventative for Wookie! :-)
IF your dog gets infected (which they can easily, via a mosquito bite...and here in the southeast, mosquitoes thrive in the warmth and humidity) the treatment can be long, and expensive.
i.e. being confined a lot in a crate for weeks (excessive exercise can damage the infected heart more) and various drug treatments, and it can get expensive...prevention is the way to go!
( My dog's foster mom got him through it, and it did involve the crating and the drugs. I always wondered if he has any permanent damage to his heart...but apparently it depends on how bad the infestation was.)
*whatever his vet thinks he can tolerate well
Rumo ~ rescue shepherd/husky mix