Dog food is not going to be nutrionally complete but I do use it as part of a grain mix for my pet rats. You'll need to find a dog food with less than 18%--this usually means a senior formula. Hopefully your finances will allow you to provide them with some whole wheat pasta, oatmeal, and some whole grain cereal to help them out a little bit with what the dog food is lacking.

Good luck, hope everything works out with your dh's job.