*I* am always a nutcase when my kids go in for surgery. I worry about all the risks of surgery and anesthesia. The dogs? They're fine. They go into the vet's office, thinking they're just in to visit their friends (I've socialized them by dropping by the vet's office just to visit and get a treat frequently when they're pups. If you haven't done this already, do it once or twice.). Or maybe, at worst, a toenail trim.
Ok, they hate toenail trims.
Frankly, when they wake up after surgery, I think they're relieved to be released to me without having their toenails cut.
Camper felt icky for a couple days, from the anesthesia. My other kids were raring to go by the next morning. My current pup came home from her spay 10 days ago stoned on morphine. She slept all night, and woke up ready to wrestle with her 85 lb adult GSD brother. She literally didn't miss a beat.
The worst part for her was having to be calm for a few days, which meant being crated because she and Camper would have ripped her incision wide open. She's pretty much healed already, and they've been back to playing.
We'll hold your hand while Boss is in surgery. Start a thread and let us know when he's going in, when he comes out and how he's doing. You'll be the one that needs some extra TLC.
HE will do great.
And my dogs' personalities never changed one bit.