Message #320535

[txhogsanddogs]

So if you use ivermectin at a high dose to worm your dog and they already have heartworms it will kill all the heart worms at once therefore it may cuase a blockage in the heart or lungs.  I suggest getting a heartworm test done at your vet before starting ivermectin  just to be safe and also have them calculate a dose for you.  Because the mounthly dose is quite small.

That's right, too much and there done.  It's better to under dose the dog once a week then too much once a month.