So my husband came home from work to find Tex in the middle of the yard flipped on his back. He wasn't even near a wall. How could he have gotten himself flipped and would there be a reason why? Everything seemed to be going well. He's eating well, pooping definitely well, eliminating urates. He said after he flipped him back right side up, Tex hissed at him and walked away taking a bite of grass as he walked. Any suggestions?