Thank you all so much for the replies. We will certainly ask the vet. This morning she has calmed down a lot so we will not give her any more prawns until we see the vet. In the meantime, apart from cat biscuits and tinned Felix, she also loves Parma ham and Spanish cheese so she can still have "treats" occasionally. These do not seem to effect her adversely. We are so glad to have found this site and will be regular visitors!!! In the meantime thanks again. Joanna, Ali, Tino and Honey Bunny