I thought it was the affectionate trait that I gave my sim cat! I was ready to delete the cat because this was so annoying. I did look at the moodlets with MCCC and didn't see anything to remove. I'll have to try the other method listed.
I have the same issue and I tried the workaround but it lasts only a few sim hours (it also removes a lot of dog interactions) and then the pets are scared again
I found this info by 83bienchen on thesims.com
"The bug is caused by the preventaive shot and the wellness-treat. In case of the wellness-treat, your pet will be constantly afraid for 4 days, in case of the preventative shot, it will be for 14 days."
I'm guessing they just accidentally added too many 0s to the buff, so it turned into days instead of hours. Unless they intended for the pets to be scared for weeks.
That's indeed a bit over the top and why the hell would you be scared by a treat ?
Guess we need a QA answer here @SimGuruNick
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The Wellness treat should have no negative effects (my opinion) but some of the other Vet treats are designed to have negative effects when used on healthy pets.
I have tested these two.
Cooler than liquid Nitrogen:
Use only in case of fever.
Negative effect Pet freezes and may require a trip to the Vet because of frozen intestines.
Poop a lot:
Use only when constipated.
Negative effect. Very uncomfortable needs to poop a lot. A long walk is recommended.