I give whole carrots as treats. They are great chewy treats for my dogs, and it's something that takes them 30 seconds or more to eat instead of the normal .2 seconds.

Since they aren't digested, they have orange poop the next day.

I actually freaked out one day when it was early in the morning and still not very light outside. I was watching Buck poop and I thought he had lots of blood in his stool. His whole poop was bright orange! Just chunks of carrots, barely anything else! LOL!