So I'm in a pickle and have a solution I want to do for it, but figured maybe an outside view might help.

So gonna get straight to it, I currently have 3 cats. Two are mine, one is not.

The cats:

1. Is my boy. He's 15 years old this month! Totally sweet and awesome cat! Loves kittens or at the very least wouldn't hurt them. Usually walks away when he's over/ done with a thing.

2. Is NOT my cat. I'm supposed to be "watching" him. He's randomly aggressive. Most notably after I give my old boy pets or attention. This is not the first time I've been "asked" to "watch" this cat. I'm convinced if he was alone in a stable home setting he'd be fine. But his owners constantly try to rehome him.

3. Is my new kitten I got yesterday. Only 7.5 weeks old. Don't know much of the personality and such yet. But so far very quiet, not a peep even in the car on the way home! Only sounds has been hissing at cat 2 and mewing after I checked on it this morning.

So my issue is even while in the carrier cat 2 was lunging and attacking cat 3. Even this morning when cat 1 went with me to check on cat 3, cat 2 was attacking the door to the room cat 3 is currently staying in. Even now cat 2 randomly goes to the door to hiss and lunge at it. I've warned the owners of cat 2 they had until I got cat 3 to figure things out where he will go. So I messaged them and get told they "have nobody else to watch the cat". They are trying to have someone watch this cat for, get this, A YEAR AND A HALF OR MORE. Under the premise that the dog where they live at now "doesn't like cats" and having him in a room all to himself is "not fair". They also didn't bother to ask me properly if I even could watch him, which is where the timeframe of until I got cat 3 came in.

With how cat 2 acts towards cat 1 and cat 3 the solution I can only think of is putting him outside. Hes not mine, I didn't ask or accept taking care of him. A few people say its mean to do. Others say they'd take him to the pound/shelter (but those cost around here to give an animal, even a stray you found requires a fee). I'm at a loss because I DO feel bad for cat 2 having owners like that, but hes not my cat and he's too aggressive for my home. But I'm also not going to sit back and have the kitten assaulted and hurt badly.

In my own experience an aggressive animal is usually isolated or kept separate. How isn't where I could advise, an aggressive cat is let out, and almost always never to be seen again.

I rarely dealt with adult aggressive cats, any kitten is essentially spoiled by me. I applaud your actions nonetheless.

I live in a one bedroom unit. Two cats pushes it 3 would be insane! I have no spare room to speak of to keep him off the other cats. So outside he has to go.

He'll still get food and such but no longer allowed inside.

My local shelter does charge a surrender fee, but they will also take anything you could give them instead of the full amount if you truly can't pay it. Call or just bring the cat over and see what they'll do for you. The worse they could do is say no.

The cat was allowed to stay inside until he peed in a reusable grocery tote (with food still in it) and on a blanket. Later that night he attacked my older cat twice so I put him outside at like 3am. Its been a couple days and I haven't seen any sign of him hanging around. I even put food outside but it isn't even bothered, which is kinda strange since I live surrounded by fields and other wildlife so I'd think theres other cats around.

That happens, my older black car R9E has drifted away from me. In the rare occasion I see him, its around feeding time. Otherwise I hear him fighting with other cats. Males tend to drift off, while females stay for the benefits.

I foster cats on a regular basis, and I would personally advise insisting the cats owner takes it back or you will be bringing it to the pound, completely as a bluff if necessary. It's not fair they've pushed that sort of burden on you? No one wants to take an animal into the pound, but the cat needs to go, definitely.

When raising small kittens, their interactions with other cats can form an aversion to them- the fear of cat may cause your new kitten to later act out against cat . Kittens form their personalities in that 2 month range, it means the difference between having a friendly adult cat, a nervous adult cat, a fearful adult cat, etc.

IF they refuse to take their cat, I would look to social media for nearby rescue groups. If you're on the west coast, you could even look into Best Friends Pet Sanctuary in a huge pinch? I'd elaborate, when speaking to rescue groups, that you've had this (aggressive) cat dumped on you. Either way, do your best to keep aggressive cat away from the kitten while it's there! This is the most formative time and not worth the risk!

Aggressive cats can definitely be dealt with, though- look into a calming collar if you have not already, they're about $20. One of my resident cats is unpleasant at times and has landed herself on an anxiety medication lol.

7.5 weeks is pretty young for a kitten to be separated from the mother - usually it's a minimum of 8 weeks, but ideally 12 weeks before they get adopted out. It sounds like you're probably already paying a lot of attention to the ktiten, which is good.

As for aggrocat, it sounds like there's a lot going on. If the owner is not able to care for the cat adequately, they need to either find someone willing to foster the cat in a stable way, or they need to straight up surrender that cat. It's not fair to the cat to be in a living situation that is stressful for it with inconsistent owners. The behavioral issues and marking that you mentioned could be a direct result of stress.

Short term, I would make sure each cat has a distinct safe place - like hidey holes in areas that they like anyway and make sure you have multiple cat boxes. The guideline I was always told (parents both work in animal sciences, one is vet) was one catbox per cat, plus an extra. If you don't have the space for that sort of set up, I would just make sure there is one per cat in different areas. If possible, it would also be worth getting the cat set up with a vet appointment for a checkup - sometimes aggression can be from physical issues. The last cat I got was bitey until he got most of his teeth pulled - they were just so messed up that he was mad a bunch.

: I'm curious to know what happened to your cat problem. Are your other two cats ok? Did the aggressive cat ever come back? Hopefully he didn't get eaten by other wildlife in the area based on how you described the area with fields and wildlife.