I saw a tv programme about dogs not long ago.- I have forgotten what it was and who presented it but one thing stuck in my memory. He said "Always remember when you have a dog in the house, you have a wolf". This may not be an exact quotation, but it was something like that, so I am a bit wary of dogs. Cats also can attack - I think there was a clip from youtube not long ago showing one attacking. However, having said that, they are both a great comfort and much more intelligent than we give them credit for. I know I would only have to start opening a tin and the cat would appear from wherever she was - could be upstairs - and sit there hopefully.