The Kuvasz should be brushed on a regular basis all the way down to the undercoat. This will remove excess hair during shedding, and will keep the hair free from mats. This breed does best in colder climates mentally, and physically. In warmer climates, the Kuvasz tends to shed quite a bit all year round, while in cooler weather, he sheds seasonally.
If your dog is displaying behavior uncharacteristic of his normal actions, call the Vet