We have one. I wouldn't say they need grooming (where they get an actual hair cut) so much as they require brushing. It's all semantics, I guess. Getting the puppy used to a pin brush at an early age every day or every other day, will make brushing easier as an adult. Even though puppy coats don't require brushing out, the feel of the brush on it's body is what you want to desensitize it to. We brush ours every several days and he loves this time. Lays there enjoying it. If you keep up with it, it only takes about 10-15 minutes from head to tail. Otherwise, yes, they collect things in their roaming and this creates hair mattes which if left unchecked, can be a nightmare.Grooming! Great Pyrs have very heavy mattable coats, needing lotsa grooming.