Thank you, CG. We've eaten eggs that had been frozen, but with the crack I was concerned with food poisoning. Glad to know I can trust the membrane to keep out the bad stuff. The dog will be disappointed, though.I had some eggs freeze in a (heated) garage fridge that cracked wide open. I cooked them for the family (those eggs were destined for sale until then). Out in the coop, I've had eggs crack but the membrane was still intact (I felt something like a crack on one so I played it safe and assumed it was, another was visible yet small). Again, I kept them for the family. I had no problem or ill-effects eating them. If the shell wasn't cracked or broken, I really didn't know if the egg froze or not. I didn't see any differences in the egg once it's thawed and couldn't tell you if it was a frozen egg or not.
Then again, I'm not known for my cullinary prowess. I usually don't care if I get brand name or generic foods. If there was a difference, I may not be capable of detecting it. LOL
CG