My dog is 8 years old and has no history of heartworms or fleas and I'm wondering if giving the monthly heartworm supplement (Sentinel) is necessary. I have given it to her religiously over the years but am on a bit of a budget these days and the supplement is quite expensive that said I don't want to do something that would be detrimental to her health.
She is an indoor dog - lhasa apso. The vet mentioned that she seems to have some arthritis in her knees and suggested a supplement for that. I would prefer that she take as few medications/supplements as possible.
