[Judith Anne]

Our mastiff puppy had it, didn't have any reaction whatever. I guess we'll have to do the monthly thing, though...

[Salamander]

Thank heaven for that.
My dogs are *always* inside during mosquito season, except for quick out-and-ins for potty.
I've seen several websites saying that we tend to over-treat our dogs.
As per the vet's recommnendation, they get *no* heartworm pills during winter.
They start them again in the spring after we have our first over-50 degree day.

[blam]

"Our mastiff puppy had it, didn't have any reaction whatever. I guess we'll have to do the monthly thing, though..."

I've not changed from the monthly dose for my four dogs. Glad I didn't now.