Hi,

It sounds like scar tissue swelling. I think it is more likely to happen in a midline spey rather than on the flank. Im sure it will go down really quickly. If you are concerned ring your vet but for gawds sake don't let them tell you its a post op hernia, this happened to a cat of mine years ago, the poor thing had another op less than a week after her spey and it turned out it wasn't a hernia at all just post op sweling, I was absolutely furious.

Izzie

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