Grethic: There is car parking and a wooden hut/toilet. Near to the car park is a large pool with a strong current for a good workout. entry to the water is relatively straightforward. Further downstream near the falls themselves are more pool but access is a bit more challenging.
I was the only swimmer here (even in July!). This site has an excellent walk for warming up afterwards with spectacular views and is surrounded by wild raspberries, strawberries and bilberries for snacking on afterwards.
Matthew Brown: The second pic I posted here is of Falls of Falloch, not dog falls. Sorry. The large pool at the top of dog falls is easily accessible and suitable for jumping and diving (where safe to do so) but I'm not sure about the main falls themselves.