I am an enthusiastic sporty dog walker! From 5 five till age 20 I cared for two dogs at home a dachshund and a beagle. I would give them 2 times a day food and walk with them 3 times a day. I have experienced aggressive behavior. My dachshund was a dominant dog and was very aggressive the first couple of years, especially to other big dogs. I learned to be patient and firm, it is also important not to be scared especially if the dog is gonna fight with another dog. My beagle was not aggressive but he had a lot of energy. To calm him down I would run instead of walking with him, so by the time we got home he would be tired to run in the house and to make a mess. At home I would play with them with a ball or a rope. I also like to teach them new tricks. If you want an enthusiastic sporty dog walker who is not scared easily, I am the guy!