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..
