Yes I can relate, our yellow lab (my avatar, yes she's a bit short-changed on the yellow) was really a sad case of lethargic hangover for the first 24 hrs. She got a lot better on day 2, maybe about 75% normal, day three maybe 90% alertness back. Day four she was full alert but still sore and you have to keep them from going full tilt for about 2 weeks if I remember correctly.
Whatever the vet said, follow it on what to let them do as far as exercise. We had to keep ours on a leash even in the yard for a while to slow her down. She really wanted to play frisbee too.
Keep her hydrated too so she doesn't get constipated from the lingering effects of anesthesia.