We had our Chihuahua puppy desexed yesterday and so far he is still the same. Nothing has changed he still runs around like a lunatic and is a happy playful pup. The vet told us we had to keep him quiet for the next 10 days. We just laughed and asked how we were supposed to do that. His stitches don't seem to be worrying him and he seems to be leaving every thing alone.
Good luck with Marley's desexing. Hope all goes well.