Yes, they're probably going to need clipping, and the time to start is now. Because of the type of coat these dogs have, it will be prone to matting, and will require a great deal of upkeep.
Now, clipping doesn't mean you have to shave them down to their undies. If you keep them brushed, it could just be a matter of doing a sanitary clip, so stool doesn't get caught in the hair, and clipping or scissoring the hair from between their foot pads, and tidying their face and ears. The coat on their bodies can be done in a longer, fluffy clip.
How often you have them groomed depends on several factors, including how much undercoat they have and how often you brush them at home. I would discuss it with the groomer you decide to use, and go from there. But, from the looks of them, I'd say every 4-6 weeks would be reasonable.
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