| There really isn't a location that is very convenient for both Tai Tam and Kowloon (which is quite a big place... do you know where exactly?). Living near Tai Tam would be OK for your dog - there are plenty of trails, woods etc on the South Side of the island. It would be a bit of a trek each day to Kowloon, but two out of three ain't bad!
And DB would be a pain in the neck for both Tai Tam and (most of) Kowloon, depending again on where in Kowloon. DB to Tai Tam is at least an hour if you get a cab from the ferry pier to Tai Tam (which is probably a HK$90 ride) or nearer 80 mins if you get the bus (a $10 or so ride). | 
