...............dog /cow/ goat
Percent fat. 8.3/ 4-5/ 3.5
% Protein.... 9.5/ 3.8/ 3.1
%lactose .....3.7/ 5.0/ 4.6
% Ash .........1.2/ .7 /.79
The percentages of fat, protein and total solids are higher in dogs milk than other types of milk.
The formula I use is one cup of WHOLE fat cow milk, yolk of an extra large egg, 1 tbsp. corn oil, and a few drops of infant vitamins. I whirl it in a blender, and strain it to get egg fiber out so it does not block the nipple. (A brand new automotive filter works REALLY well, but a nylon will do).
I've hand raised a couple of litters, and supplemented quite a few, using this formula. NOne of them had any issues and grew up just fine.