Have you ever looked at the ingredients on a shampoo bottle? Most ingredients you can't even pronounce and most are full of chemicals that are hazardous. They add these things so the product lasts forever. I looked up all these products and was shocked 

There are many Natural preservatives you can add to make the shampoo last but these are expensive and why the big shampoo companies chose to do the hazardous chemicals instead

I only use Organic natural ingredients in my shampoos, detanglers and conditioners which leave the coats smelling good, shiny and most of all Healthy