
Hi Pam
Stuart Little sounds like a typical, happy, self-centred little chap (aren't they all LOL) and would very probably enjoy a canine companion even if not necessarily needing one :)
If you do take the step of adding a puppy, go for a bitch as opposite sex pairings are the ideal to avoid future conflict. Personally I would never again through choice have only one dog as my own experience has taught me that they have much more enriched lives for enjoying each others company :) However, we can each only give you our personal experiences and there are many things to be considered such as finances (vets bill or double insurance premiums), kennelling if going on holiday will be more costly, domestic arrangements for having a family/friend as temporary dog-sitter may be over stretched if for two dogs etc, etc.
HTH, regards Teri :)