I think the best harness available is the Help’Em Up Harness, shown above.  It’s ergonomic for you and your pet, very well made, and has helped many families feel more able to successfully manage large dogs especially.
You can find these harnesses here: https://helpemup.com/

A device that is proving to be useful for pain and wound management, and that you can use every day at home, is the Assisi Loop.  This company has developed many therapeutic options in the area of targeted electromagnetic field therapy.  You can find out more about them here: https://assisianimalhealth.com/