I read something about this from another poster in the General Q&A area and it made me realize Presley is the same way. It seems that in order for her to have a solid poo, it needs to wait all night until she goes in the AM. She eats (Innova Puppy) around 5pm, most nights she has a BM (soft, not diherria but just a little soft) after dinner and/or before bed between 9-10pm. She goes for a 20-30 minute walk about 6:30am and when she poo's in the AM the 1st link of two is hard and dark in color but the last 1/4 of it is softer and a lighter color.
I switched her to Innova from Sciance Diet because I had read it was more natrual and could help reduce the amount of times she has a BM. She had a hard time being house trained and was going 3 and sometimes 4 times a day - in the morning, around lunch, and after dinner or before bed (some day's both after dinner and before bed). She is fine with th ehouse training now though. We feed her the recommended amount on the Innova bag (1 and 2/3 cups a day) for a 23lb 

up.
She is 10 months old and perfectly healthy so frankly I'm not sure if it's something to get too concered about...
I can't really remeber but I think she had more solid, darker poo when she was on teh SD - should I go back to SD? try somethign else? not worry about it?