I have house sat many many times for mostly small dogs. I have housesat my neighbors, my aunt, and my boss. They all had small older dogs so I am experienced with dogs of all sizes. I personally have a medium-sized middle aged very healthy dog and walked him every day while living at home (i moved to Santa Barbara for college I am originally from the Bay Area). My bosses dog was a rescue but got used to me fairly quickly so she would always ask me to watch him. My neighbors dog was old and sick so I am familiar with giving dogs medicine. I also had a very healthy and energetic dog and am an active person myself and I love long walks and cuddles!