Could you please share what company you ordered it from? I need to do this asap. I have 3 dogs and having the same problem as everyone else this summer. Frontline is just not working. Thanks!
I'm not the original poster, but I use Equine Mega Store in Australia. I also get my heart worm meds from them without prescription. Never had a problem with any of their products and their exchange policy is great. I accidentally ordered the wrong size one time and they exchanged it without a problem