Quite frankly, you're in a gray area. If the dog isn't also a family pet and all it did was the therapy visits, I would have no problem with deducting all of those expenses. However, if the dog goes out (for example) once a week and the remainder of the week is the family pet around the house, I don't see any deduction for medical and vet costs. If the grooming is required pre-visit, that may be a deduction.
I''d like to be more specific but again, it's a gray area, and I can't recall ever seeing a case on point.
