Neutering for Chihuahua

My male Chihuahua dog went through the neutering surgery last month and is recovering from it.  He is almost 5 years old and we were worrying about getting it done, but considering several factor including benefits in future health, decrease in marking and mating season stress, we went for it.  It is rather a simple surgery for males, we went in the animal hospital at 8:00am and he was ready to go home at 5:00pm.  Chihuahuas are very cuddly and always want your attention.  After the surgery, he needs even more attention.  I don't know if it is because of the scariness of the hospital experience or it is the hormone level itself.
Here is a picture of my cute and adorable sleeping chihuahuas: