By mreilly2380 from Duluth, MN
I had the same problem with my cats. It was the scent thing. I sprayed both of them with perfume and that seemed to solve the problem instantly. Good luck!
I agree with it being scent related. Beyond the unfamiliar odors from the vet's office, the spayed kitty's personal odor may have changed temporarily from the anesthesia or possibly permanently from being spayed. I am no expert but I would imagine that maybe hormonal scents are different after being spayed. Am not sure but I don't think cats reconize one another so much visually but rather by their scent. They just need to get to know one another again ;-) They'll be fine in just a few days :-)
The problem maybe that your "fixed" cat no longer smells right to her friend. Give it a week for all the strange Vet smells to disappear and I bet they'll be back to best friends.
I had a similar thing happen with my cat & dog. They are great friends. Dog went to vets for day surgery and the cat hissed and hide from her for three days, when she came home. Things got gradually better over a weeks time and they are back to be buddies again.
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