Needing a bit of advice here.  I have a neutered, male, mainecoon cat which is 9 yrs old.  We rescued him at just over a year and after getting used to the house change, we started letting him outside, which he loves.  He doesn't wander far as his 'turf' seems to extend from the road behind us and the road in front.  He came from a hoarding situ and as such, seems to be friendly with other cats.  He will sit in 2 other cats company and has done for a few years.  We find this funny as they seem to be holding court and discussing the worlds problems lol.  Anyway, a new cat has moved in.  He seems to be just under a year old and he is a tiny, skinny moggy with a major problem.  He hates my cat!!!  Thye fight all the time!  And it's not just my cat, it's his 2 buddies as well who have now disappeared from the area.  But this cat lives 2 doors away from our house so my cat needs to stay around this area.  How do we stop the fighting?  Will it ever stop? 
We tried keeping our cat in but he yoodles all night to get out while head-butting the cat flap!! He even ran outside with the dogs first thing this morning to escape which was taking his life in his hands as the first thing outing is a stampede!
How cat I help my poor, ole cat? 

Does the new cat have an owner ? If so mayb a chat about neutering if cat is still entire may help. -if a stray - would take him to rescue. Hopefully one of cd cat people thinking. Marriane here will be along with suggestionsm.   - understand the difficulty of keeping a cat in mine mog does the same if he needs to be kept in for some reason goodness what a noise and the crashing on the cat flap is unbelivable just noticed you know where he lives so forget the rescue bit !

I have spoken to the new cats owner(half-jokingly)about the state he's got the rest of the cats in.  They say they will neuter him but not till he's full grown.  All the rest of the cats are neutered.
He lives 2 doors away but he constantly comes up to our livingroom window(I think to annoy our cat).  I let the dogs out as they chase cats they don't know but he still doesn't care.  He's quite a fiesty little thing.  Our big dog is scared of him and he knows it as the big guy will walk round him rather than past!!  You can actually see this little cat laughing!!
I love cats but I can definately see now why some folks don't like them.  They are a law unto themselves!!

Not a cat person (hope Marianne will be along soon :)) but I thought the idea was to neuter before they start this sort of behaviour not after they were fully matue and it was established.
You could try copying off something like this for them
http://www.cats.org.uk/transport.aspx?404;http://www.cats.org.uk:80/what-we-do/neutering/more-about-neutering

I had to keep my Siamese cat shut in the boiler room for 4 days when we had a visiting stud dog. He uses that room all the time as his food and litter tray are in there away from the dogs, but he is used to using the cat flap in the wall there. The noise was unbelievable when he found that he couldn't get out - he protested loudly as only a Siamese can. But I daren't let him out as he loves dogs and was convinced that it was a misunderstanding and if he was persistant enough this dog would start to love him. The dog thought otherwise and was determined to eat him lol
You have my sympathy at least I knew it was for a limited time

By the time he's full grown their house will stink as he's likely to start spraying long before that, and once he's in the habit of spraying it's unlikely neutering will have huge effect as the smell will be his cue ;) - At least this is what I would tell them ;)

It isn't cast in stone as some Toms don't spray much but no guarantees either way ;)

I knew a cat breeder and cattery owner who used to neuter any Toms who found their way to the top of her property.  she wouldn't take the chance of a mismating, infection etc.  and had an agreement with the local vet.  As far as the owners were concerned Tom went off for a few days and came home and stayed ;)

I do so feel for you, I had the very same thing happen many moons ago with a new neighbour who moved in,

My cats also used to sit on the drive with others in cat meeting. :-D No trouble for years then the new neighbour arrived with the cat from hell, one of my cats was beaten up daily, it is the most horrible situation to be in, it only really ended when they moved, I used to spend my days running outside with a garden brush to separate them. I would squirt the cat with a water pistol (which is the only 'force' the RSPCA will allow you to use) when it started walking across my walls, conservatory and fences that did stop it from entering my territory, unfortunately the driveway was up for grabs, which is where most attacks did happen, but the cat would leave when it saw me. (The water pistol lady)

So water pistol to move him along and garden brush to separate,

My Maine Coon (not the attacked cat) never left my house, he was a house cat who was quite aloof with other cats so yours is totally different to mine.

The only other thing you can do is get special cat fencing to keep your cat in his own garden or a cat outdoor pen to keep him safe, but I know that is hard when you have given your cat the freedom to roam, however small his territory.

I was lucky that my trouble maker moved, but I have to tell you the experience left my cat very territorial the bullied became the bully even though he was neutered, he was a very loving cat but spent most of his life in one cat fight or another, I'd hate for your Maine Coon to go the same way. I may entertain a cat pen if he so misses the outdoors.

You know, his attitude to life has allready changed.  He used to be such a confident, proud cat.  Everyone knows him in the area as he is such a big character but since the attacks, he's turned sleekit and quiet, always slinking about and jumping at any noise.  He is spending a lot more time home now as last night he slept inside(first in a long time!) and went out this morning so I don't know if he's just worked out a timetable with this other cat!!  Maybe they've agreed to share turf?!
I think I'll trap the wee b*gger and take him to a new home miles away!!!!If only I weren't a cat lover, eh!
PS  I've tried the 'spray conversation' but they seem to want a big cat rather than a clean one! But I might get him sniped without their knowing!!haha.

My BIGGEST worry would be that the skinny entire cat -who probably already has mated the queens in the area -is in fact positive for FIV and could infect your cat with it if they fight -the likelihood is quite big as it it is an entire male. Build a run for your MC and let him use that -it's what we do. It saves lives in more ways than one. :)

http://www.fabcats.org/owners/fiv/info.html

I thought this was one of the things cats get immunised against?  I am probably wrong but I thought that was how we could then let them out?  If not, that is really worrying as he has mingled with other cats all his life with group grooming sessions been witnessed on numerous occassions and he has had a few fights in his life too. Being 9 now, I would need to assume that he more than likely has FIV?

I  had 5 cats up until a few years ago now  down to just one old boy who is around 13ish and he rules the roost over my 4 dogs... next doors cat and him are of a similar age and seem to get on fine lying together in the drive ..problem we have is neighbour has now taken on 2 cats who are now around 1yr old ... they annoyed the heck out of my dogs and one of them kept jumping down and sitting on our back step so we have to check cat is not there before opening the door which is a pain and also attempting to jump down when the dogs are in the dog area to go into my kitchen.. I am afraid I dislike it... but I have to squirt them with the hose ..not directly but in the area they are to move them away as it concerns me I am on friendly terms with my neighbour and she knows all about this and is quite happy for me to do this...
So what I am saying is when you see this cat.. only thing available to you is to squirt it if it goes near your cats area and hopefully it will stay away.Worked for us.

Find out if the cat protection in your area is doing a scheme offering cheaper neutering and pass them the info might be the cost that is delaying him being done .. 12 months is late for a male to be left to his own devices.. :)

I thought this was one of the things cats get immunised against?  I am probably wrong but I thought that was how we could then let them out?

No there is no FIV vaccine in the UK. The one that exists (in the US) was never brought here as it was felt it wasn't any good, basically.

FeLV feline leukaemia virus can be vaccinated against.

FIV -akin to human HIV but spreads mainly through fighting biting as well as sexually - there's no vaccine for.

An un-neutered tomcat given full freedom which can be up to a mile radius territory or more, fighting with any cat he comes across and also fighting to mate, and mating, is a potential FIV reservoir.

For some reason they also don't tend to spray in their owner's home, but flood anyone else's, another reason why owners have no idea how their beloved Tibbles has a dual ASBO life outside! In cat terms he'd be leading the looters and directing the rape 'n' pillage to follow....lol