A dog is lame if they are visibly limping or if the body has to compensate for a limb. In either case this can be seen as an uneven bobbing movement.
There are many causes including; over exertion, body slamming with other dogs, falling, slipping, orthopaedic conditions or long term inactivity following surgery.
Massage can help by:
relaxing over tense muscle and removing painful knots
breaking down adhesions that form between different tissues
releasing jammed muscles so that each muscle can work independently again
reducing pain and soreness
re-modelling scar tissue so it becomes more flexible and supple and reduces its restrictive effects on the tissue
Remember I can only help your dog with your vets consent
Razzy stiffens up and starts to limp if he doesn't get a regular massage