Thanks for all the input. I do think I want to try grain free for a while and see how it works. I actually LOVE Merricks food, but my dogs pick out the veggies and leave a big mess on the floor for me to clean up

So I am now searching for small kibble like Merrick, with NO veggie pieces in the food, and grain free to start off with. I am feeding some samples of Artemis Maximal mixed with my Canidae. They are getting a little bit of runny poops now, but I am thinking it is just because of the change.
Another reason I am looking to change is because their poops are large. I read that if they were actually digesting most of the food then poops wouldn't be so large or so many. Is that true?