Hi Cathy – you can look for a clinic if this isn’t emergent. Usually they’re lower cost…BUT they’re only for dogs without a diagnosis of cardiac issues. If your dog has a suspected problem like dilated cardiomyopathy, you should go directly to a veterinary cardiologist…and yes, they’re expensive outside of cardiac clinic events. I would recommend reaching out to the nearest Doberman club or rescue to see if they know the next clinic event – that’s how I got my Dobe tested before she developed DCM.
I’m so sorry you have a need. I hope your dog isn’t symptomatic.
I can’t fathom what this might be, though a toxicity comes to mind. Definitely get her to the vet.