That is exactly right.

Raw meat is already 70% water, so 1 lb (16 oz) of meat is actually 11.2 oz (336 ml) of water. This is exactly why raw-fed dogs don't bother to drink alot of water compared to kibble-fed dogs.

It might be worthwhile to actually measure a dog's weight, to the ounce, before the work ... and then measure his weight, to the ounce, after the work ... and get a firm handle on exactly how many ounces are being lost due to the work (and thus need to be replaced after the work)

Jack