Struvite stones are bladder stones that develop in both dogs and cats. The condition accounts for over a third of all urinary tract stones in dogs and about half of all urinary stones in cats. The problem is seen most often in female pets at middle age.

If your chicken gets a "clog" in it's crop it cannot digest food and will eventually die if you don't help break it up. This sounds daunting, but it's not. It's pretty common actually. The important thing is to identify what did it, and then avoid exposure to that again. It's usually long stringy grasses.