Which Dog Flea Shampoo?
Truth be told, you may not need an insecticidal dog flea shampoo to kill the fleas on your dog. Warm, soapy water is enough to kill 90% of the living flea population on your dog. The trick to finishing the job is to use a special flea comb to remove the eggs - otherwise when they hatch the infestation starts all over again...
If you do decide to purchase an insecticidal shampoo STAY AWAY from DEET (diethyltoluamide)-containing products. DEET has been implicated in severe allergic reactions in both cats and dogs - and has resulted in death. Safer's flea shampoo is a popular variety that uses no DEET.
At the same time you bathe your dog, clean his favorite resting spots - shampoo the carpet, launder any bedding, and hose off the ground outside with soapy water. This will kill any fleas waiting for your doggie's return.