I’ve never made a dog run by the side of a bike I have steady trotted a dog by the side of a bike to a reasonable fitness just before the season starts I normally do short distances till I’m comfortable that the dogs comfortable then add a mile to the distance your doing but at this time of year it’s pointless as the pavement is to hot to be trotting plus there’s no point in having a dog in peak fitness before the season starts remember there’s fit then there’s running fit