hmmm pet owners are a very particular type, many of them will only follow the type of animal/animals they have, hence why dogs online is only dogs, i dont know if there is specialised cat forums or fish etc, there may well be, would have to check it out.
So i dont really think an all in one forum would have the impact neccesary, but I suppose it depends if it costs you any money to set up or not, if its easy and cheap give it a crack, if its going to cost much time and effort then think some more before you decide.

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