Hi all, we have two house cats (baldies) who normally only go out in the garden in warmer weather. One of them goes to the toilet wherever she likes but if given the chance she will always run outside quickly go and then run back in. I have put in a cat flap for her but she wont try and go through it! She will go through it if you hold the flap up. Has anyone trained their cat to use the flap and how. Thanks!