mixx,
what i have done is left the skin on while smoking and then when it was done removed the skin, took the fat off and dried in a food dehydrator with no ill effects to my 2 greyhounds.
here is a good recipe that moose and corvette love if you want to try it
1 lb chicken livers
1 cup corn meal
4 eggs
pinch of salt
whiz the ingredients in a blender till smooth
put in greased 8 x 12 pan
bake at 350 for about 30 mins or until a tooth pick comes out clean
it should work ok for puppies as greyhounds have kind of sensative stomaches
hope this helps you
jack
ps now you know how we came up with our company and team name