I do that with the lard it does help, a few years ago I bought a very skinny beddy whip pup I seen it in a traveller site and took pity on it,my butcher gave me a few kilo's of chicken skin and within two weeks she doubled in weight.
I have the opposite problem with my springer ray since I got him neutered in Sept I can't keep the weight off him,he's walked every day and cut down on food.
Cracking pic pal, used to be loads of them in the Fields across from my mother's you could hear them singing if you were in the garden I used love hearing them but haven't seen or heard one in over 20 years I put it down to Foxes there was a bit of a boom in fox numbers around the time the larks went.