Tonya: I like to feed 2x a day to all of my cats and dogs personally. Specially with some breeds of dogs you have to worry about bloat and feeding 2x a day can help with that.
I also think you could fair well on a food change. What your feeding isn't a great brand, and it might be attributing to them getting fat.
Now I know even though some of these brands "look" like they cost more then what you are feeding now, but they really don't. It's a bit longer to explain, but just take my word for it, over a period of about 3 months, you will wind up spending pretty the the exact same, or less, or slightly more (were talking a couple bucks here) over a period of 3 months. Which is not a big deal, if in exchange you get dogs who are in excellent physical health!

I would personally stear clear of Iam's/Eukanuba and Science Diet. And any of the low grade foods out there (most of what you will find in grocery stores/walmart).


Some foods to consider are:
Artemis
Azmira
Canidae
Chicken Soup for the Dog Lovers Soul
Evolve
Breeders Choice Health Food
Holistic Blend
Natural Balance
Natures Variety
Pinnacle
Royal Canin
Sensible Choice
Solid Gold
Show Bound
TimberWolf Organics
Wellness
Wysong

Good luck!!