the fleas on my dog seem to love this product, ive used it every 8? weeks as per instruction. and the fleas are doing just fine. bob martin must be laughing at the idea of selling water in a dropper at this price. with the idea that a discerning dog owner will be a return customer, as long as there dog never gets fleas and they buy this as a preventative. if the dog actually has fleas? you might want to try something that works, and if you find it, please get in touch, my dogs mental health needs it.