Good question, what is going on?
My little terrier died, 12 plus years old never had heart worms. My pitt bull is 10 years, never had heart worms. He has the softest, thickest hair, really nice.
I thought giving the preventative heart worm meds would kill a dog with heart worms.
They gave him the first dose at the vet's and kept him all day for observation. The vet said that if he survived that, he'd be able to handle it.