NEVER user human shampoos and conditioners on your dog! They are very harmful to the PH balance of your dogs skin.

If you want to use a conditioner, purchase a dog conditioner and dilute it to make it go further. There are some that are not that expensive and last a long time. Personally, I think brushing whenever necessary is a good solution. I brush my Dusty (he has a very full and plummy tail) about every other day.