These two are ridiculous

Hi everyone, I really need some advice or success stories here because I’m feeling a bit lost.

​My partner and I just bought a house, and the previous owner kind of left behind their 10-year-old cat. The cat is an absolute angel, super sweet, calm, and kind.

​The problem is our 6-year-old dog. When he was just 3 months old, he was severely traumatized by a neighboring cat that attacked him. Ever since then, he has completely associated all cats as a threat and cannot accept them at all. Whenever he even senses a cat, his anxiety spikes, and he goes into a frenzy.

​Now we are trying to live under the same roof with both of them, and we want to keep everyone safe and stress-free (especially the sweet senior cat).

​Has anyone dealt with a dog who has historical cat trauma? How did you slowly introduce them, or is it even possible for a 6-year-old dog to unlearn this? Any tips, training methods, or management strategies would be hugely appreciated!

He really likes her !

Trying to understand Petey's body language here and if this interaction is ok for both animals (additional video and picture in imgur link):

https://imgur.com/a/J58DYDk

Claws were not out during any of this and he ran off for kibble right after before returning to sniff Rhubarb (Chihuahua mix).

2nd video was a minute prior. Petey had his front paws folded under but also kind of looked ready to pounce.

Prior to both videos he was trying to get through the gate but didn't seem stressed. He pawed the air in front of her a couple times before running off and returning to repeat. Ears not back, tail not puffed up, and no claws out that we could see.

He and Rhubarb have had a couple supervised interactions prior to this where Petey has come up and sniffed or licked Rhubarb. They were also both napping in the same room earlier this week without either being held.

Background: Petey has been with us for a couple months now and we're trying to get him and 3 dogs acclimated (1 dog at a time starting with Rhubarb as she's the most chill).

A couple hisses early on from Petey but nothing for at least a week. My wife is wfh and usually has Rhubarb in her office with the gate closed so they can see each other.

No barking or other loud/aggressive behavior from Rhubarb.

We had a cat previously who was absolutely not ok with other animals (dogs or cats) and very clearly went on the offensive. Not sure if Petey is just trying to figure things out or if he's scared/stressed but not as aggressive about it as our previous cat.

I’m pretty sure he still thinks she’s a small weird dog

no one is harmed, the photos are just too dramatic 😭😭 they love playing with each other and basically cats sassiness dominates 😂😂😂

COMMENT A PHOTOS OF YOUR CATS DOMINATING THE WORLD 😂😂 I WANNA LAUGH SO BAD

Merlin, the coonhound mix, and Binx, my rescue void.