Quote from: MistyMorning
I took everything out & still have it. the testing cheats keeps them from dying till i can get them restored enough not to disappear beneath the earth 

If you use the boolprop controlpets on cheat, just command the sunken pet to do some other activity, and they will pop right up and go on their merry way.
I never used any of the mods that other people are blaming for this. All the mods I use have been pet approved and verified to not cause trouble. It *may* be a conflict of some kind between mods, but you aren't the only person with no mods to still have the problem.
Check out what the pet is doing just before sinking, and my guess is they were trying to use an object another pet is using. That cause has been quite consistent in my game. Not random, at all.