Why is my cat's anus hole enlarged?

i've got three cats in my house, so i can see the relative size of each my cats' anus holes. In all seriousness, the problem is that one of my cat's anus holes seem to be enlarged by atleast a couple cm or so in diameter. I'm a little concerned. Is she constipated or something? Should I go to the... show more i've got three cats in my house, so i can see the relative size of each my cats' anus holes.

In all seriousness, the problem is that one of my cat's anus holes seem to be enlarged by atleast a couple cm or so in diameter. I'm a little concerned. Is she constipated or something? Should I go to the vet?
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