If you are currently training a dog, these standard industry "rules" are often used alongside specialized guides like Makoto Kai: The 3-3-3 Rule
Before you touch your dog, you must observe. Makoto Kai trainers spend the first 15 minutes of a session simply watching the dog’s breathing, tail carriage, and pupil dilation. The goal is to read the dog’s Ki (energy). Training only begins when the dog is in a state of Seijaku (calm stillness). Makoto Kai - Training Dog -Jap-