Thanks for your help I will look into some of the things you all have mentioned.
As for the food they eat, I feed them California Naturals, chicken flavor. I did a lot of reading up on what is a good brand and what isn't. I found this to meet most of the criteria’s I was looking for. So I am pretty certain it isn't the food that is causing the problems. They are just real big, and very furry.
I have heard before to use green beans but on a dog of mine. Does this really work to help pass obstructions like fur balls? Thanks for all your help.