Thanks guys (eh sorry girls) for all your help. There are definately some things to consider.

The cycling doggy walk... well... Baziel (our white jumper ) runs an average of 23 km/h. And he's got an incredible stamina.

We call him our flower power dog. All he wants is to share his love and freedom.

De French Bulldog (the dark one on the pic) never runs away.

Thanks a million!!!!!!!!