I found a couple things online, I got some at petsmart called baby bebe that i'm happy with though.
The recipe for a homemade dog shampoo is as follows. There are several slight variants of this recipe around but they are pretty much the same. You should mix together a pint of liquid dishwashing soap (Ivory, Dawn or Dove are gentle enough), a pint of water, a pint of apple cider vinegar and 4 ounces of glycerine. You can buy glycerine at the pharmacy. Combine the ingredients until everything is mixed together well. Keep it in an airtight, easy to pour container and clearly label it. You can use one of your old shampoo bottles if you like.
or you can just use baby shampoo I have heard too.