Naomi wrote: "This was taken last year around Barstow, California, from a man that used to work with Richie. Notice it appears to be a female but it also has those pads on the back."
Well this is a game changer! Until now,
I have always taken it as gospel that only the male blue dogs have the weird
pouches on their haunches. But, as you
say, this photograph does definitely appear to be a female; no external
genitalia, and, what appear to be nipples hanging down. I would hazard a guess that this is not just
a female, but a female that is, or has recently been, nursing.