Mathematically Unlikely Scenarios Here. MUSH

Planning is good -- realistic planning is better.

If your bug out plan is walking 400 miles to grandpa's farm:

25 mi/day = 16 days = 32 MRE's. Roughly 32 pounds of food.

this assumes flat ground, good weather, no opposition/gridlock and being in shape and 2-3 mph. Near perfect conditions. ( Numbers are all estimates, use your own research)

Great

But what if--

you have a puppy and a small human with you you?

15 mi/day = 27 days =81 MRE's. 81# +/- of food in your pack

That's nearly 50% of your body weight in just food.

As always, do the math. Don't be MUSH-y.