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 mine.
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 had to pay also 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)