I honestly thought CoQ10 was just an "expensive frivolity," an unnecessary supplement for a dog already eating a premium diet. But my vet explained that "age-related decline" starts long before you see symptoms, and CoQ10 is vital for cellular energy in a working muscle like the heart. The capsules are perfect because, unlike messy powders, they guarantee the right dose and I don't have to worry about him sniffing out the flavor. Now that I’ve started giving him CardioK9, the peace of mind knowing I’m actively supporting his strongest muscle is worth every penny.