Many people *think* they have their dog under control and they DON'T. I commute to work and a lot of people walk their dogs off leash on a section of multi-use trail that I travel. It's just stupid and dangerous to let the dogs run where there are cyclists. Your dog doesn't have to be nasty, viscious or bite to knock me down - and don't compound your stupidness by throwing a ball for the dog around a blind corner on the wrong side of the trail puleeeeezee... I complained to the local Animal Control and they actually went down and ticketed one day! On that same morning (they called me to follow up that they had been to the area - good customer service!) I had a dog charge me out of the bushes (there are trails on the hill about the path too) - owner wailing its name - guess they thought they had voice control NOT!