Most of the dogs you meet on rides are family pets and are not mean. They chase for two reasons one to protect their family (and stop at the end of their property) or they're bored and chasing bicycles is FUN (just watch the TDF and see everyone chasing Lance). 99 out of 100 dogs are playing. Don't be afraid of someone's pet. Just ride on and they will stop at the property line, or tell them to STOP! GO HOME!!
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I can't ride and Frown!