I love doing bodywork and writing about it, but there are times when massage is not appropriate:
The first 24-48 hours after an injury is a time for veterinary care.
The first couple of days of an illness, especially when fever is present, is not a time for bodywork.
If heat or swelling are present, do not treat those areas with massage (though cold laser is very helpful ).
If there is head bobbing lameness, call the vet.