Instruct: Classify Amazon reviews into positive or negative sentiment
Query: It can be TOXIC and OH MY GOD THE SMELL

This kept the fleas at bay for about 1-2 weeks, but had to be reapplied diligently to retain its effectiveness and to be honest, the smell and the amount of time required to use it was not worth the benefits. This product smells like the dumpster behind a Burger King. I am not joking. That is the first thing that came to mind when I opened the bottle. For heaven's sake, do not, under any circumstances get this on your clothes because you are stuck with a nasty brown stain and that Burgery smell. I made the mistake of applying it to the dog's coat while shampooing him with bare hands and it took literally DAYS for the smell to leave my hands. Also, after buying this, I learned that IT CAN BE EXTREMELY TOXIC TO ANIMALS! I would not recommend it at all.