I once fed my Corgi turkey that was beyond "a little smelly" in fact, I gagged twice as I was getting it outsde for him.
No adverse effects at all. Dogs' are designed to handle that kind of nasty stuff, in the wild, they' eat meat that was dead and rotting in the sun for days, so a little off smelling chicken is absolutely fine.
When we fed Ania once a day, we would give her 1/2 a chicken (split down the back & breast). Now that we went to 2 meals/day, I cut the fryers into quarters. So two meals are the wing/breast/back portion, and the others are leg/thigh.