Greater Swiss Mountain Dogs grow up fast. They are large, strong, smart, and stubborn. You have probably heard that they are difficult to potty train, this is not because they are not smart but because they are a large breed dog and it takes longer for their bladders to mature and be able to hold urine. Swissies also have a high tendancy to bark, they are a guard dog and barking is how they alert you to strangers or perceived dangers; or just when they are excited because thier favorite person came for a visit. Swissies also have a natural instinct to herd, this would include children and cats. Early training to curb these natural tendancies is important.