Nasruddin's wife wants to get a cow. Nasruddin says there is no room to keep a cow with the donkey in the stable. She insists. Nasruddin prays to God to kill the cow so the donkey can get some peace. Next day, Nasruddin finds donkey dead. "God, can't you tell the difference between a cow and a donkey?"
Notes: Compare Nakosteen: donkey gives birth to a colt, but she dies, so Nasruddin needs to feed the colt the milk his family needs, so he asks God to take the colt off his hands, but instead the cow dies: Can't you tell the difference, etc.