I bred a litter of bullhreys about 17 year ago,they were six in the litter,all of them were forward,playful an responsive,no backward step apart frome one.
Dark brindle dog,he would just sit at the door of the kennel an not come out,would take the playful argy Bargy with the other pups serious an try an nail them,all the pups were gifted out,my friend chose the dark brindle dog but I had to hold him him for a few months till he got new kennel setup.
The dark brindle dog would stay the same the duration I had him,wanted to do his own thing wasn't interested in me or the other dogs,he