I don't want to sound like the Voice of Doom, but this situation sounds VERY much like what we were going through at our house over the past year.
About a year ago when we got our newest family member, Meg, our two resident boys Zorro & Einstein got along reasonably well with her. However, as the months went on, things became increasingly strained with Meg and Zorro -- hissing, growling, etc.
I did all the "socialization" stuff I could find, such as playing with them and giving them treats in one another's company (along with about a million other things that I'm not bothering to mention here). I also put Feliway plug-ins in strategic locations throughout the house (and on a stretchy collar for Zorro, who was the main aggressor) -- but to no avail. It just got worse and worse until this summer when Zorro was actually attacking Meg -- and there were actual vet visits required by both of them for their bite wounds. We were willing to try medicating Zorro, but he refused to take the pills and would find ways to spit them out when we thought we'd gotten them into him.
My ultimate solution -- not the greatest, but the best I could come up with -- is that I keep them separated at all times. One of them is upstairs with limited access to the rest of the house on a given day, and the other is downstairs with somewhat more room to roam -- and every day I switch them out so that they alternate locations. (Einstein gets "joint custody", and visits back and forth whenever he wants -- if he "begs" at the closed door, we let him go to the other side of it.)
I wish you the very best of luck and very sincerely hope that things between Taz and Paizly do not deteriorate in this same way. However, I will VERY strongly urge you not to leave them unsupervised together; Paizly might not like being stuck in a room for a few days, but it would be preferable to having the two of them get into a physical confrontation.
All the best,
Diana
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