actually you just need neighbours with doggie health insurance - most medical insurance companies do pay for physiotherapy - yes even for dogs, if prescribed by their veternarian .... also the place I've been talking to does some 'you swim with your dog' as well .... essentially renting out the therapy pool, the cost isn't unreasonable to take your dog for a swim once a week, especially if they're old and athritic and it's the only exercise the poor bugger gets.
Also we'd be only the second such facility in Nova Scotia - the other is a 3 hr drive away in Halifax, we'd be covering pretty much Shelbourne to Bridgewater
And making a living for us is pretty cheap - $24K a yr clear and we're living the high life, $18K a yr clear and we're managing ok, $12K a yr clear and we'll get by