My puppy is 100% housetrained, she's 8 months old and hasn't had an accident in the house since she was 2 months old. But lately I have noticed something peculiar about 2 mornings a week.

Star sleeps on a mattress on the floor of our bedroom (she's too big to stretch out in her crate) and in the mornings when I pick up her blankets, once in awhile a very small hard round ball of stool (about the size of a wad of chewing gum) falls off onto the ground. At first I thought it was something that was stuck to her behind from doing her business the night before and just fell off into her blankets while she was sleeping.

But this morning I found one and I know she didn't poop outside before bedtime, as she had fallen asleep early last night. This morning was about the 5th time in a month.

Is this uncommon or something puppies do from time to time, or is it unheard of? I'm not sure why this would be. When she does poop, they are normal - firm, not runny, but not white and crumbly when they come out - only if I leave it on the ground for a few days. She's not constipated. She poops about 3 times a day. Would this be poop that didn't get squeezed out at the proper time, and then got squeezed out while she was sleeping, (therefore relaxed)?

Anyone heard of anything like this before?

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http://www.leerburg.com/forums/ubbthreads.php?ubb=showflat&Number=165630#Post165630