Why is my cat suddenly attacking my other cat?

“When we came home, the next morning Panda viciously attacked Ziggy and scratched his ear so badly that it caused a portion to now appear missing on his our rim”source ↗

“It’s been almost a month and his behavior has not changed.”source ↗

“We are completely lost.”source ↗

“My black cat has started doing since roughly April or May. He’s never done it before that.”source ↗

“He’s starting to hurt her slightly by grabbing her skin and holding her down.”source ↗

“So I’m kinda just wondering if anyone has experienced this and if you were able to manage it in anyway”source ↗

“I will just be on my phone or sleeping and hell start biting me.”source ↗

“Since then my two male cats have been at each others throats.”source ↗

“I’m at a loss of what to do here.”source ↗

“I’m scared to leave them home alone in case it turns serious.”source ↗

“I’m desperate to go back to normal.”source ↗

“As he has gotten older, Enchilada is still very affectionate with Dip but turns on him really quickly for seemingly no reason.”source ↗

“My two cats both 3yo, Harrie (Male, tuxedo) and Lientje (Female, black) are suddenly fighting more often and I don't get why.”source ↗

“Harrie does not seem to understand the boundaries, and I have to admit I don't either.”source ↗

“Orange cat misbehaving”source ↗

“The problem I am having is between Baloo and Cheddar. Out of the blue, Baloo has begun to suddendly be aggressive and hostile towards Cheddar, who, in return, recoils and backs away.”source ↗

“He’s not been neutered yet so i’m just curious if this is sexual behavior, asserting dominance, parental-ish or what lol.”source ↗

“I separated the two with a paper towel roll (😭), they’re now taking turns in their carriers and sniffing out the living room for the “threat”.”source ↗

“Now I’m just worried.”source ↗

“Idk, any advice please??”source ↗

“To my eyes, she will more or less randomly decide whether the touch she is receiving is good, and unpredictably scratch my hand often.”source ↗

“It’s gotten to the point where, despite loving her and wanting her to be happy, I get resentful and teary eyed when she asks me for cuddles, knowing I’ll just sit there watching her roll around, and when I try to touch her, the chances are very high that I’ll walk away physically and emotionally injured”source ↗

“I'm not sure what to do for a long term solution. I just want them to get along again, I worry about what might happen when I'm gone.”source ↗

“Especially since he's been ambushing her outside one of the litter boxes and she's stopped using it.”source ↗

“At times, however, the older tuxedo will act oddly towards the kittens (eg. cleaning and then biting, random pinning). Want to get input on what this behavior is and if we should let them be.”source ↗

“Resident tuxedo cat and two new kittens are settling in well, but the tuxedo sometimes grooms then bites or pins the kittens — asking if that's normal or needs addressing.”source ↗

“one of my cats is a big asshole to his siblings (and younger half siblings) also his mom to but like why?”source ↗

“he keeps hitting his sister and little (half) siblings should I be worried or care at all”source ↗

“She will follow me upstairs and bite my leg(hard not playful) while I’m walking up the stairs.”source ↗

“Or when I come to pet her she will bite me with full force.”source ↗

“She’s never done this before and it sort of raises a concern for me.”source ↗

“I went to Finn and he hissed at me and tried to scratch me.”source ↗

“One of my boys loves to give 'love nibbles' at 3am on my nose. He hasn't worked out how to do it gently yet though 😅”source ↗

“I was laying on my bed and she was on my chest and I moved her and she went to bite me.”source ↗

“The biting at the dog was a warning to not mess with her (the cat).”source ↗

“Its happened to me a few times. My orange saw another cat in the yard, through a screened patio...he couldn't get to the cat and got me.”source ↗

“About two weeks ago in the middle of the night I woke up to all : under our kitchen table growling at each other and tails real puffed up so I separated all 3 of them for a full day and put them back together and they where fine.”source ↗

“Now for the past week it’s like once a day they’ll be playing or chasing each other around and they all start growling and puffing up at each other for no apparent reason.”source ↗

“I currently have them separated again and not too sure what more I can do.”source ↗

“since I brought her back home my older kitten (already fixed months ago) is hissing at her constantly and is refusing to interact with her. I can tell this is upsetting the younger one.”source ↗

“My partner and I recently moved in together, so now their two cats (Penny and Ziggy) are now living with my cat (Mabel).”source ↗

“However Mabel and Ziggy have been having issues. Ziggy is much bigger than her (around 15 pounds - he's on a weightloss plan) he's a gentle giant (has never hissed/swatted at her once) but he is very interested in her and invades her personal space which causes her to hiss and yowel and swat him.”source ↗

“What am I missing? What else can I do to help them get along?”source ↗

“Does it automatically mean she could be sick or in pain? Or am I overthinking this.”source ↗

“Even though it's been a week, she may be stressed by the move and new environment, but hiding it.”source ↗

“Mine fight like hell too.”source ↗

“He’s bullying my other cat”source ↗

“We too had to use Baby Jail for a long time with our kitties. We don’t have to anymore, but we still have the cage open in the main room just in case”source ↗