It's been 6 months now and the dog is the same stinky, hairy, needy, whining, pooping, lovable, kind, necessary member of the family as ever. No fishhook was ever produced and no problems whatsoever. Here's the dog and her boy. Yes, the boy is a dwarf and he has a purple mohawk. When you're a dwarf you can sport a purple mohawk, no problem.
Any dog that thinks it's a fish isn't quite right! Kidding of course. They're both very cute. Apparently the acids in a stomach can dissolve a fairly signficant amount of metal. Fortunate for the pup I'd say!
“We are the universe contemplating itself” - Carl Sagan
It is quite amazing what can be passed through the entire GI tract without problem. I have even seen razor blades and sewing needles go through without problem. I hope Nala is feeling well. I suspect she will pass it just fine. It is usually a bigger problem when they swallow something like a rag that will ball up and cause an obstruction. As an aside...I do not think searching for it at the other end is worth the risk of injury. Since it is metal it can be followed on xray if you are curious.