HartzVictims.org
Yes all products have their naysayers...risks, hazards etc...but Hartz has caused many a problem over the years. Their products are not designed for little dogs but for all dogs. Their chemicals are stronger etc...
Our little pups need to be vetted and prescribed meds especially for them....using Hartz is risky. I for one would NEVER use something like this to rub on an open wound on my little Yorkies body.
I used the hotspot med on Mini when I thought she had a hotspot and my Vet freaked the hell out on me for doing so. It made her spot worse and she specifically said don't use any chemicals on Mini unless I say so. Good enough for me.
Additionally, my mother put a flea collar from Hartz on her rather small full grown cat. I can't even tell you the grotesque sight 3 days later around that cats neck, to this day I will never forget it.
I just wouldn't use something like this on Yorkies or any small dogs, actually I wouldn't use Hartz for anything.