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It started as a cough. Just a little one. At night. After he settled in for bed. I thought it was allergies. Dust. Maybe the new air freshener I bought. I googled it. Made myself feel better. Went to sleep. Then it happened again. And again. Every night around 2am this wet, rattling cough that would wake us both up. My Cocker Spaniel, Biscuit. 11 years old. Still ate well. Still wagged his tail every time I came home. But something was off. I took him to the vet. She listened to his chest. Took a long pause. Then said three words I wasn't ready for. "He has a murmur." She explained it as gently as she could. His heart valve was leaking. Blood was backing up. The cough wasn't allergies — it was fluid slowly building in his lungs. His heart was working harder and harder just to keep up. "This is stage B," she said. "We're going to watch it." I drove home with my hands shaking on the wheel. Here's what I didn't understand yet and what I wish someone had told me sooner: The cough, the fatigue, the not wanting to walk as far as he used to... these aren't heart problems. They're energy problems. Your dog's heart beats over 100,000 times a day. It is the hardest-working muscle in their body. And to do that job, it needs a constant supply of a molecule called NAD+. By age 7, most dogs have lost more than half their NAD+. When that happens, the tiny power generators inside heart cells called mitochondria start to fail. The heart doesn't get enough fuel to beat as strongly. Valves weaken. Blood pressure rises. Fluid starts to build. This is the real reason hearts fail in senior dogs. Not weakness. Not bad luck. Cellular starvation. And that's the gap that Pawprint Protocol was built to fill. It delivers NAD+, NMN, CoQ10, and Resveratrol — the four compounds with the strongest evidence for supporting heart cell energy — in a liquid that absorbs directly into cells. Up to 98% absorption. Compared to pills and powders that lose most of their potency in your dog's gut. I started Biscuit on it four weeks after that vet visit. Week two — the nighttime cough was quieter. I actually slept through my alarm. Week four — he walked the full loop around the block. Something he hadn't done in months. Week seven — my vet listened to his chest again. She looked at me with a small smile. "He sounds steadier," she said. I'm not pretending this fixes everything. I know what we're dealing with. But I also know that Biscuit is still here, still wagging, still full of life in those brown eyes. And he's not coughing at 2am anymore. 90-day money-back guarantee. If you don't see a difference, you pay nothing. Because if there's a chance we can give them more good days — we owe it to them to try. 👉 [See if Pawprint Protocol is right for your dog →] https://pawprintlab.com/pages/the-hidden-reason