What served as the strictest judge in determining the suitability of breeding stock during the Redbone’s formative years?

Answer

The environment.

The harsh reality of the hunting grounds, which served as the strictest judge, weeded out hounds that lacked stamina or a reliable nose, driving the functional selection process.

What served as the strictest judge in determining the suitability of breeding stock during the Redbone’s formative years?
OriginDogbreedhoundRedbone Coonhound