Thanks everyone

The vet said its just one of those things that can happen to small breeds and not connected to her treatment.

If we had not noticed she was unwell it may have led to seizures etc.

Finally got to speak to the breeder today who said she had no problems before but did we want another dog from different blood lines (I think not was my husbands repy).

Think it will be a while before we condider a new dog.

Thanks again all its a big help being able to post and get support.