Your body is working hard to make milk to feed your little one so you are burning lots of extra calories! (momming.com)
For overweight dogs, adding mashed, diced or chopped raw fruits and vegetables to meals helps fill them up and satisfy them without adding lots of extra calories. (dogcare.dailypuppy.com)
In fact, it's very very difficult to make bigger muscles unless you are eating lots of extra calories. (gorgiewellness.com)