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I'm with Jen on this one. That seems to be very odd and I don't think it has anything to do with being happy she got prawns. I really think you should get in touch with your vet and check it out to see if she is possibly allergic. It's definately strange and merits looking into. In the meantime I don't think I would give her anymore prawns, not until you are sure what this reaction she is having really is. Good Luck and let us know what your vet says.