It’s difficult to cycle with a dog when the dog is on a leash and is pulling. That guy’s dogs wants to come and sniff my dog.
In some places, like the UK, it’s illegal to cycle with your dog. There’s been at least 2 recorded incidents where the cops have arrested, no just pulled over, arrested the dog owners and seized the dogs because “it could be dangerous.”
Cycling with a Running Dog: Vancouver, BC
One guy, in Blackburn, Lancashire, had to pay a fine of £260 plus £340 for the court costs and on top of that. He also had to pay a legal bill of £2,000 for his defense. (source Daily Mail, a UK newspaper)
A woman in Burnley, Lancashire was arrested and stripped searched for using a bike harness with her dog. She was detained for 3 hours and eventually was fined £40. (source Daily Mail, a UK newspaper)