Pet Sitter Needed

This job requires caring for two dogs: an older 10 years old, easygoing medium-sized mixed breed (no medical needs) and a powerful German Shepherd 6 years old. My German Shepherd is not friendly toward other dogs and requires someone with large-breed experience who knows how to maintain clear boundaries and handle a reactive dog with absolute confidence. Someone with a dog training or behavioral background is strongly preferred. No other pets can be brought into the environment during this time. Please reply with your specific experience handling reactive working breeds.