I am sure I have replied on this topic before, but I will again. Of course it is just my opinion/thought, but here goes...
I believe that present day, the blue color in pitbulls is attributed to amstaff blood. Maybe 90 years ago, there were blue game-bred dogs, but 99% of the ones seen nowadays can be traced back to ast blood in the pedigree. It is a dilute color, and IMO does not just pop up.
If you go back far enough in the pedigree you will see amstaff in most blue dogs pedigrees. I have heard "stories" of people with blue dogs that are pure gamebred dogs, such as Lonzo, Chinaman, eli and other lines....However, when this supposed dilute color just shows up, it is usually in people's yards that are not well known or newbies ...which leads me to think "hung papers". Since it is a little strange to me that breeders like Lonzo, Boudreaux, ect breed blalc to black for many generations, but blue does not just "pop" up in their lines, directly from their yards.
Now when I see a nice looking blue apbt
on the street or at a show, do I think AMSTAFF? No, I think show bred pit bull, because most blue dogs are pitterstaffs. I personally don't consider Amstaff a four letter word like many APBT
I actually do not care for the solid blues much anymore myself, as it seems to be a favorite newbie color and many backyard breeders and ambullies specialize in it.
Can a blue dog be "game"? Yes, if all that is in there is amstaff and pit bull, yes they could be, but are they gamebred....No, not in my opinion.
Can there be athletic, correct, hard working blue dogs? Yes, there is, I have seen them and owned them.