Been feeding kibble and ground beef scraps for a long time, been fasting the dogs once a week just as long even during winter and we have harsh winters here. The key is to fatten the yard up before winter hits, same goes with summer get some of that winter weight off the dogs before it gets hotter than a french whore house. It has been my experience that some dogs stay skinny all the time no matter how much you feed or worm them. Could be they have something else going on but I am not fortunate enough to have a vet that I can trust. Have only ever lost one dog in the heat and two in the cold. The two in the cold were old dogs that I expected to go anytime.