Luckily mine just get the hosepipe in the garden every now and then and the Chocolate Labrador swims every day so it isn't really required. I have no idea what it costs but we have a mobile trailer that comes around once per month and offers the service in your driveway which is pretty decent. I would guess it would be around $20-$30 for this service and having 2 dogs adds up pretty quickly. Dog food is around half the price of rump steak per kg so they are not cheap any more to feed either.