Dog Troubles

I was eating lunch in a park that had a heavily trafficked bike lane running alongside it. About every 30 seconds, the dog belonging to the woman sitting next to me would go berserk and start barking like it'd been set on fire. It took a few minutes to figure it out, but I realized the dog would go nuts whenever it saw someone on Rollerblades or a skateboard. It had issues, but I was more disturbed that the owner would sit down next to me and ruin my lunch with her twisted dog. It barked so much, I thought it might lose its voice, then I realized I'd never heard of a dog losing its voice. The thing is, you wouldn't really ever be able to tell a dog had lost its voice.