Dogs can be trained to be intelligent with bicycles. Mine loves to run fast alongside the e-bike on a riverside path - and biking rather than walking the dog also keeps her running straight, rather than exploring sideways or investigating others. She also likes to ride in the trailer. It’s dogs that are stuck too long behind fences that are more likely to want to bother cycles. Another hazard for a bike is intercepting one of those very-long dog-leads.