Hi, I am seeking advice on the best breeds for a companion lapdog. It is essential it has a quiet nature and doesn't bark very much, as it will be with me under my desk when I am working away and surrounded by the public. Shih Tzu have been recommended but I am concerned they have a reputation of being difficult to house train. It will also need to get on with my two young cats. If you can offer advice and/or suggestions I would greatly appreciate it. Thank you.