I have a 4 year old Doodleydog who is currently on her way here to Perth from the UK.
In the UK I'd never had her professionally clipped. Instead I would religiously brush her every week. This seemed to help her deal with a hot UK day.
I'm concerned that due to increased heat levels here, brushing won't be enough. But, on the other hand I worry that clipping back the coat may affect its waterproof qualities (like most LD's, she loves a good swim).