Cook had her own special pooping grounds where she always went (no training needed). Maggie is more random, but graviating to a certain geographic area of the yard.
Sadie is like Cook was, there's one specific spot for pee and one for poop, never shall they coincide. Creates a lot of walking when we're on the road for her to finally give up in desperation and find a new spot. Millie on the other hand was of the "walk an drop" method who felt it was necessary to not miss a single spot in a 40 acre field while doing a half squat, duck walk. Muffin was a "grass connoisseur", it had to be the right height, the right color, the right smell, and the right density or she was not going period. Lastly Lola, bless her heart, you could tell her to poop or pee, and she'd immediately squat and do her business, no matter where, even in a parking lot.