Cats and Dogs pack severe-constant bugs

Product: The Sims 4

Platform: PC

Which language are you playing the game in? English

How often does the bug occur? Frequently, anywhere between 5 minutes to 1-2 hours of gameplay.

What is your current game version number? 1.111.102.1030 DX11

What expansions, game packs, and stuff packs do you have installed? 

Horse Ranch, Vampires, Snowy Escape, Realm of Magic, Lovestruck, Island Living, Goth Galore, Get Together, Get to Work, Get Famous, Discover University, Cats and Dogs.

Steps: How can we find the bug ourselves?
Step 1.) Create Save file with 40 played sims/households.
Step 2.) Have multiple Sims with maxed out all skills, and a vast majority of Aspirations completed, as well as excessive inventory items.
Step 3.) Have any pets with a house full of items, and tight corners/small rooms near doorways, also with decks having stairways.
Step 4.) Perform actions on pets such as "Feel the love" and "Go for a walk" and "Send Prowling/Hunting."
Step 5.) Watch pets become "stuck" unable to move, and then become "Uncomfortable" due to being unable to move for long periods. 
(Note: While going on walks, the dogs start walking in areas of the map they shouldn't be able to walk, and the walk never ends. Both the sim walking the dog, and the dog itself become severely broken.)

What happens when the bug occurs? Pets become "stuck" and unable to move. Pets clip through terrain and "fall" under the ground.

What do you expect to see? Pets to behave normally, such as being able to move, and not traverse off the maps.

Have you installed any customization with the game, e.g. Custom Content or Mods? I did, but they have since been removed..

Did this issue appear after a specific patch or change you made to your system? Yes, after installing Cats and Dogs.

Please describe the patch or change you made. I downloaded Cats and Dogs expansion pack.

I have also included the most recent bug I experienced after about 5-10 minutes of gameplay after doing all of the following:

• Make a backup of  theSims4 folder in Documents\ElectronicArts to an external drive or a different place on your harddrive (or to a flash/external drive). This is only a backup if anything goes wrong. You won't need this folder for the further steps.
• Rename your theSims4 folder in Documents\ElectronicArts to Sims4_Backup
• Start the game (All your save games will be gone, your options will be reset to factory settings and all your custom content will be gone. Not to worry, it's all still there in that backup folder). You will also temporarily loose your event rewards. Those are saved in the file usersettings.ini.
• A new Sims 4 folder will have been recreated in your documents\electronicArts folder. Some folders might be missing for they are only created when you need them.
• You will need to start a new game for your old saves are still gone
• See if your error is gone.

The Error is gone now

• Starting putting the folders back, starting with your saves. Check your game after every folder.
• The Tray folder contains all your downloaded houses and Sims that show in your library.
• AccountDataDB.package file contains the unlocked event rewards. Make sure to copy that back.
• Only put stuff back from your mods folder that is verified to still work.
• ALL custom content can potentially cause problems. If you found out which folder is causing problems, put your stuff back in groups or one by one until you find the guilty party.
• Not all folders need putting back. See this for what folder does what: User files explained

Same Error still exists

Either make your own post,  following the guidelines here: Help us helpers to help you or if you already have one and were referred here, post there.

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Keeping your Computer updated

• Out-dated graphic and sound drivers, missing Windows Service Packs and other components that are not up-to-date can cause problems with your game. Make sure you you update those regularly.
• Computer maintenance is important. Defrag your Computer, clean your Registry and get rid of temporary files on a regular basis. Also clean the ventilators from time to time and if you have a desktop open it up and clean it inside.
• Backup your important files. That goes for your music, your photos as well as your Sims User Files. You'll find the user files in Documents\ElectronicArts. Copy the whole folder to an external drive.

• Use the cheat resetsim <firstname> <lastname> to reset a particular Sim in your town. You won't loose any progress, all it does is put the Sim to a safe location from where he can start acting again
• Restart the game or the computer
• Go traveling
• Go to Manage world and move your Sim out of his home and then back into the same one. If you have money troubles, use the cheat freerealestate.
• Load a backup game.
• Start a new game to see if the error is only happening in the current save game. Make sure to completely close down your game before starting a different game. Not just go to the main menu.
• Start the game in windowed mode

(Note: I have performed all of the above that is applicable. Using "reset sim" did not fix the cat. After using the cheat code, the simply popped back up on the surface level, but still was unable to move. I had to force use the pet command to "call pet" the little whistle icon on the pets household picture.)

I have seen frequent and ongoing issues with pets ever since installing Cats and Dogs. Both cats and dogs, especially while at the Vet Clinic, appear extremely broken, running against walls, becoming stuck, having to cancel and reapply actions and many other issues and glitches with both cats and dogs.

My PC specifications:

Operating System: Microsoft Windows Version 24H2 26100.2605
Processor Intel(R) Core(TM) i7-14700F 2.10 GHz

Graphics Processing Unit: NVIDIA GeForce RTX 4060
Installed RAM 32.0 GB (31.8 GB usable)
Device ID 37072665-3E39-4444-A430-21AE7EDE2D18
Product ID 00326-10000-00000-AA167
System type 64-bit operating system, x64-based processor
Pen and touch No pen or touch input is available for this display