I should have asked the vet when I was there last week but I didn't. Chelsea, age 14, 5.5 lbs is due to be groomed on Tuesday. The groomer suggested I give her a baby aspirin prior to bringing her in because she is older and a bit stiff. I am concerned about doing this because it seems like a big dose for a little dog. She also has a newly developed asymptomatic heart murmur, which probably wouldn't be impacted but who knows. Any thoughts?