Once I have taken care of 15 dogs and uncountable cats for two weeks. These people had a spectacular huge home with large property and could not say no to any stray. One was diabetic and needed special food and medication. I was able to keep the crowd in line almost all the time. There was that holiday with the fireworks however where I had to break up a battle. I managed it with a bit of assertion. I do not do pet sitting normally for a living - I am currently staying in Seattle. I work an 8 hour day in Everett and stay with my sister in the Magnolia neighborhood in Seattle. House/pet sits should be north of downtown unless on the weekend. The dog behavior training was at Coos Bay Police Dept. about 10 years ago. I had a friend who was disabled and got herself a feisty black lab pup I did the classes with Buddy while she vacationed.