So I'm having an issue with a specific animation. Whenever dogs or cats of any age/size do something requiring the sitting posture, they glitch out and the game cancels the action and snaps them back to a standing posture or resets them entirely. As dogs sit for many things and cats eventually need to sit in order to clean themselves, this eventually causes errortrap to record ~40 errors per cycle. I don't know how long its been going on, I just know it started reporting like crazy when I installed Errortrap. My game tends to lock up periodically and it gets worse the longer I play a world leading to a household being almost unplayable before the first generation even gets to be elders. I've come here looking for advice or a workaround. Some way to have the game ignore the animation and just have the animal t-pose or something for the duration? I don't care if it looks terrible, I just want to be able to play the game again.

I looked through the error logs made and all of them are triggered by pets in sitting posture and I noticed my own feline being incapable of washing themselves because of this animation glitching out.

Hi there, and welcome to NRaas.

Could be mistaken, but it looks to me like you have an idle pets animation mod from another source that is incompatible with your patch level or is acting up in other ways. The sitting on the ground postures that the script logs are reporting is what the pet happens to be doing when the error occurs. It's the Idle Manager, showing up further down a bit, that I believe is throwing the actual errors.

System.ArgumentException: The list is empty.
#0: 0x0000b throw in Sims3.Gameplay.Core.Sims3.Gameplay.Core.RandomUtil:GetWeightedRandomObjectFromList (Sims3.Gameplay.Interfaces.IWeightable[]) ([51C90F20] )
#1: 0x0010e call in Sims3.Gameplay.ActorSystems.Sims3.Gameplay.ActorSystems.IdleManager:ChoosePostureIdle (Sims3.SimIFace.Enums.ScriptPosture,System.Collections.Generic.List`1,object&,Sims3.Gameplay.ThoughtBalloons.ThoughtBalloonAxis&,bool&,Sims3.SimIFace.ProductVersion&,int&)

If you run a test session of your game with NRaas mods only and the scriptCache.package file in your TS3 user game folder cleared (deleted), do you get better results?

Will also point out, although probably not related to pets and idle animations, you have a couple of outdated NRaas mods there.
Overwatch: you have v117, the current is v122 (you're missing a lot of helpful stuff there)
StoryProgression: on the base mod, you have v265 which is not compatible with some of the later add-on modules that you have; the current version for the base mod is v267.

Yes there's an outdated idle tuning mod at play.