u/it__wasnt__me__

Hi, I picked up some pig hearts for my 40kg malinois as the butcher didn't have any chicken hearts which are his favourite meal topper. He doesn't really like raw meat so I thought is boil them up as I do with the chicken hearts. My question is, is the left over water/stock worth sprinkling over his kibble? If so do I need to remove any of the scummy froth off the top or is that good too? Thanks in advance.