Hello and thanks for researching this very important question!
When working with rescued pets, we often have to go from "scratch" if there was no medical history passed on from the original owner(s).
Heart murmurs are "extra" sounds made when the heart is beating...usually, the vet hears a very smooth and regular "lub-dub" sound. Any time extra sounds are heard, the vet listens carefully to them to try and figure out where in the heart they are coming from, and how loud and harsh the sounds are. Some dog breeds are more susceptible to heart defects and heart disease (Miniature Poodles included).
A "grade" is assigned to try and describe the extra sound(s)...there are 6 levels of severity ("1" being the most soft and quiet, and "6" being the most loud and harsh). This kind of description is a bit subjective, but gives a starting point for thinking about an individual pet's cardiovascular health.
Many dogs live their entire lives with heart murmurs of varying severity with no ill effects, even if the original cause has not been diagnosed. Heart murmurs can be congenital (present since birth), or acquired (due to the development of some illness)...when no medical history is available, it is hard to know how concerned to be about this symptom.
A Grade 2 murmur is relatively soft and quiet, but definitely present. Your vet may suggest additional testing based on the blood results (like some xrays of the chest, or an ultrasound study if you are very worried). Vets become immediately more concerned about murmurs over Grade 3.
Dogs with significant heart disease are sluggish and unable to exercise indefinitely...they cough strenuously when rising from sleep, when doing "light" exercise such as going downstairs or walking to the car. They often have trouble swallowing food and water.
Here is an article that you can review:
Heart murmur general description
There is not usually very great cause for immediate concern with a Grade 2 murmur, but this is something to keep track of with your vet in case it changes over time.
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