He's a beautiful boy, and he looks like he's in pretty good shape, but that doesn't rule out the possibility that he's lost or abandoned. Do you always see him in the evening, or is he around at different times of day as well? Seeing a cat at various times throughout the day and night is an indication that the cat may not be spending any time indoors, and makes the lost/abandoned scenario seem more likely. However, I agree with Carmel: the fact that this cat is roaming around unfixed means that, owned or not, some action needs to be taken.
I'm of the opinion that if a cat's owners can't even be bothered to neuter him before letting him outside, I'm not going to hold off on getting it done out of courtesy to them. Any unfixed cat that ends up on my property gets fixed, owned or otherwise. I have a zero tolerance policy when it comes to people who are irresponsible enough to let their cat roam unfixed. If you don't want your cat fixed, don't let it outside; simple as that.
People who choose to have indoor/outdoor cats accept a certain amount of risk. I take the stance that having your cat spayed or neutered by a caring neighbour is one of those risks and, hey, unlike most risks, this one actually has all sorts of benefits in the event that it occurs! People with outdoor cats have a social responsibility to spay/neuter; if you can't be bothered, then I can't be bothered consulting you about it.
Cats that are unfixed (males in particular) are prone to door dashing, so it's not beyond the realm of possibility that this cat is lost, but if that's the case, I would expect that someone would be looking for him. Keep an eye out for posters, and ask around; try contacting local shelters, vets, and pet-related businesses, like pet stores and groomers, to see if anyone has reported a cat missing that matches his description. Meanwhile, take the cat to be scanned for a microchip--if the cat is unfixed, the odds of him being chipped probably aren't good, but it never hurts to check. If you can, without causing Munch and the bunch undue stress, keep him somewhere isolated, like a bathroom, for a few days while you look for an owner.
If the rescue is no kill and has space for him, and the cat is obviously tame, I would let them take care of the cat's neuter surgery, so that you don't have to incur the expense. I've paid out of pocket to have cats fixed and vaccinated on a couple of occasions, but, even at rescue rates, it's not a negligible expense when it's someone else's cat. Most of the cats that I have fixed go to a feral spay/neuter clinic, which I can access for free because of Toronto's TNR policy (I had to take a course and register with the clinic). If your municipality has a similar program, you may be able to get the surgery done through them, in the event that a rescue can't take him.
Proud people-mommy of Galileo, Dante, Cosette, Autumn,
Ramona & Choco-cat (and foster kitty, Poe).
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