How old is your dog?
Our poodle was spayed at 14 months... on the day of the surgery she was woozy, but not too out of sorts, could still walk/toilet etc.
Next day she was very sleepy and clingy, wanted to sit with me (or on me), vet gave her painkillers for each morning for a week, but she didn't seem to be in pain beforehand. Not sure if sleepy was from painkiller or post surgery effects.
Day 2 she was basically back to her normal self, and whilst we kept her quiet, she was happy to do most things....
We didn't walk her for 2 weeks until stitches came out, as she runs like crazy at the park and we didn't want her splitting the wound or getting a stick pulling the stitches etc.
And whilst she had night 1 in the "cone of shame", we put a child's tshirt on her (tied at waist) to cover the wound, and she was much more comfortable. A friend's vet didn't cover her dog's wound at all, said that females often leave it alone, and he only recommended the cone if they do lick/fuss at wound.... but I felt tshirt was better protection if I was out of the room etc.