Is it possible for a neutering to be unsuccessful?

I had a 3-year-old stray neutered about 3 weeks ago and brought him inside. I let him go outside yesterday while I watched him from inside. I turned away for a minute, and when I looked back he was mounting a stray female. I was able to catch him and brought him back in the house and he howled for hours trying to get back out to the girl cat.

Later last night I realized he had urinated on my couch. He has been very good for the past 3 weeks about using his box, so I'm wondering if he was "spraying."

He is also very aggressive with the other cats I have (although I'm introducing him slowly and hope he gets over this eventually.)

Also when I look at him from behind, he still looks like he's half, um, "intact" shall we say. My other neutered cats both look pretty androgenous.

I left a message for the vet who did the neutering, but I haven't heard back. And I'm sort of embarrassed to question his workmanship.

Any help would be appreciated.

Thanks!

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