To state that putting dog $#@* on a gun made it look better , doesn't say much for the quality to begin with.
Jerry,
Nobody said anything about putting it on a gun. He used it as a method to age new wood to match that on antique clocks.
However, examine his methodology. We use all kinds of different acids to stain and age gunstocks. Dog @#$%/!! is highly acidic with HCl because they evolved from meat eaters who had to digest meat, cartilage, gristle, etc. Burying it in the ground and allowing micro-organisms in the soil to digest it would also work on the wood in doing so. The process would also induce some warping and end grain splitting and when washed and dried would no doubt result in some artificial shrinkage too.
Given some of the $#@* that various people smear on gunstocks to make them look old, his method probably isn't that far off base.
