BTW. . .When you buy by the gallon, all those shampoos are concentrated, so you mix it up in other bottles and the gallons last a LONG time. The bottles I've got right now, Barkly's had that white shampoo his whole life--4.5 years. I used Dannyboy's Bronze Luster on top of him while Danny was still alive.
The Shed Patrol he's had since he was 2, and the Dark Beauty Vlad's whole 3.5 years.
I've still got a half-gallon of Vlad's 2nd gallon of conditioner. but I use the conditioner full strength on his beard and fall. I wash his beard and fall first, and allow the conditioner to soak the whole time that I'm washing and conditioning the rest of him.
Generally each brand has it's own concentrated strength. Once you start doing the math, it's a lot less expensive this way.
If you have a dog that gets flaky, this shampoo works great too because it exfoliates and it smells really nice:
http://www.jefferspet.com/products/vanilla-walnut-cond-shampooIf you notice, it's dilution is 8:1