dog has a nice capacity to find out the things which are eighther stolen or misplace. even post earthquake saving life of the wounded peoples, dog is a good finder.
dog is just a very good friend of man, even dog is a vigilant and alert animal in all other animals. dog has a good capacity to look into the night very well, but lesser as compare of the wolf or fox! (I am not confident).
I have found one thing in dog (domestic dog), never try to bark on the child? but frequently bark on the elders!!
dog can better work for the helpless, physically handicap people in assisting them to bring the newspaper from the table, to bring the spectacle from the shelf.. etc.