care taker of the house

That really depends on the breed of the dog. It is different when you see a doberman and a chihuahua. Some dogs are known to be affectionate and non-aggressive. Seeing such breed won't install fear at the stranger. But whatever is the breed, the common thing is that they will wag their tails to display their love and affection.

I love dogs. I have a Labrador Retriever. He is so loving. He thinks like a 5-year old kid. When I go home from work feeling tired, if my dog comes and kiss me, I feel revived and energetic again. Strangers fear him because he is such a huge dog and barks very loud. So no strangers can come near our house without alarming the whole household that there is a stranger near the house.