Heartworm is an awful parasite! Having seen a dog sick with an early stage and treated for it, I would go a far way to make as certain as possible no dog of mine ever has to face it. I've had three Yorkies(two of them very small dogs) over the years on regular heartworm preventative and none of them, thankfully, ever had a bad reaction to the preventative NOR did they ever contract heartworm.
I'm so sorry poor Callie was lost to it. R.I.P., Callie girl.
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |