Does your dog have bad breath? You’re not alone. Canine halitosis is a common issue, but it’s not something you—or your dog—should have to live with. That unpleasant odor, often brushed off as “normal dog breath,” usually signals an underlying dental or gastric problem. In some cases, sudden or unusually foul breath may even point to more serious illness.

The good news? Bad breath is highly treatable, and with the right care, you can help your dog enjoy fresh breath and better long-term health.

When most people think of assistance animals, the first image that comes to mind is a guide dog—a loyal Labrador Retriever, Golden Retriever, or German Shepherd leading their handler safely across a busy street. These extraordinary dogs provide independence, safety, and confidence for people who are blind or visually impaired.

But did you know there are some surprising facts about guide dogs that most people don’t realize?

Is “one-of-a-kind diversity” a contradiction in terms? Not when it comes to dogs. Canis familiaris is the only species on the planet with such incredible variety: the towering Great Dane and the tiny Chihuahua, the sleek Dachshund and the muscular Rottweiler, the elegant Afghan Hound and the playful Yorkshire Terrier. Today, there are around 400 recognized breeds—and countless mixes—within this one species.

So, how did dogs become so diverse? The answer lies in their unique bond with us.