my answer
no is because they won't think of "doing that thing" anymore. no testes, they have no male hormone. can refer to any bio book. Which organ produce the sex hormone? mouting is another thing. It can be because he is showing his "Big Brother" pattern but def not horny. my friend had sex on the day her dog went for sterillization and the dog got horny also when he sensed something and his penis actually enlarged and he was crying in pain, after a cold cloth applied on the wound, he was okay then. now(after 1 year) his dog's penis becomes even smaller than normal size penis from an unsterillized dog, well, she has 2 same breed dogs, she did compare both.
now this neutred dog is no longer horny nor even bother to sniff her when the couples are on the bed making out..