shy timid dog

I fed a dog for three years that I had really high hopes for. her mom, dad, and all litter mates were jam up dogs. this gyp was so chy and timid that when i would walk out to feed she would roll over on her back and stick all four feet in the air and pee all over herself. everytime i tried to get her to bay, she would do the same thing. put her in a bay pen a few times and she would try to climb out. wouldnt give a hog a second glance unless it was when she was running past it to get to a gate. it was dang embarrasing, the way she acted, you would have thought i beat on her. finally had to cull her. really didnt want to, but the bottom line was, she just didnt have it in her.