When we brought our pets to the humane society to have them spayed and/or neutered, they were kept overnight and we had to bring them back to have stitches removed a week or so after surgery.

When I had Charlie neutered however I dropped him off at 7:30am and my parents picked him up at 5pm. He had dissolving stitches so I did not need to bring him back to have them removed.

Of course, the shelter had low cost spay/neutering so it was less than $100 to have them done, but Charlie's surgery was over $200.

So I would call around to a few vet clinics, ask their policies, talk to some pet owners in your area about their experiences with vet clinics in your area and who they recommend, etc. Always feel free to call the clinic and ask questions, visit the clinic, share any concerns that you have. A GOOD clinic will listen and be more than happy and willing to answer any questions you have, be understanding of any concerns, and never get irritable!