Just sounds like she's not lactating and the babies are starving to death. Did they ever have full milk-bands? If not, don't breed those two again.

Also, I don't recommend JUST feeding dog food. It's dog food for a reason. What brand is it? I use Wellness Senior and it constitutes "maybe" 15-20% of my mix(50-60lbs every time I mix it up). Stick with good quality(mazuri or Harlan, NO Kaytee AT ALL)) lab blocks, pasta, cereals, dry Stay away from undiluted peanut butter too, they can choke on it. No bread(unless crunchy) and no tortillas(They WILL choke, no question).

Also, i hope you're not keeping that male in with the females 24/7. Some females are easily stressed, not to mention they get pregnant immediately afterwards. It's not a healthy situation for her, her nursing babies, or her unborn babies. She needs at least a month to 2 month rest after the first litter is weaned, then you can safely breed her again. If the male was in with her after she had babies, and she wasn't lactating, she's already pregnant anyway... So it's going to happen all over again...

I wouldn't breed either of them again, just MHO.