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Good warning. I also believe that the other topical products can cause illness and death in some of our let's. I truly believe that is what happened to my sweet 6 year old cairn this year. I had used frontline on her all of her life and feel a bad batch poisoned her. I miss her so much. IF your dog gets sick, lethargic or legs give out after treatment, use BLUE DAWN immediately to wash it off. I wish I would have known. The forums on Amazon have a huge thread about this. It's too late for my sweet baby, but this might help one of yours. I love these little cairns.