I've had dogs since birth, and have been the leading provider of training and care for family dogs since I was 10. I've never cared for other peoples animals for money, but I have had 5 dogs left to me in wills and when people I knew were simply unable to care for their pets. I never was very interested in teaching pets any tricks passed giving the paw and other paw, but I was able to teach multiple dogs to stop begging, stop barking too much, and stop eating other pets food. However almost all tricks or behaviours can be taught using the same formulas, and I'm happy to teach your dog tricks as an extra if you want. I'm a big beliver in being very strict with dogs, but never hitting them, there's research to show hitting dogs causes issues as well as solving them, as well as research into how dogs are more relaxed in a clearly defined hyerachy, as they basically don't have an urge to fight for the alpha possition because it's clear as day who it already is. Which isn't too diffent to people. If someone leading is clearly competant and in total control, other members of the group don't feel like they could do a better job and act out.