I'm caring for a neighbors chickens while he's gone. their coop is terrible, unclean, with a tiny run and he feeds crappy. sadly they are actually far better off than previous hens he's had. He doesn't give them any calcium supplements at all. The egg shells are definitely way thinner than my girls, in fact I have to be far more careful carrying them back to the house. Mine I frequently just slip into my coat pockets. One hen has her two center toas either broken or deformed, I can't tell. Could this be from calcium depletion? If it is I'm going to take over a dispenser and several pounds of oyster shell at my own expense. We agree to watch their animals knowing if we don't no one will. Thankfully they're down from goats, geese, cats, dogs, and chickens to just 3 hens and 2 barn cats. The first time we watched them my husband essentially rebuilt their crap coop to at least give them some shelter from the rain and to get them out of standing in ankle deep mud. Another neighbor is a real goose nut and has prevented any of their geese from suffering long by arranging their regular disappearance. He has always left a handful of feathers behind to make it look like a predator got them. If we can't keep them from having animals we'll do the best we can to make their lives better.