I've a feeling that if I tried to drag him along he might be able to slip out of his collar, but luckily he's very responsive to the lead so I don't need to. And I wouldn't have the strength anyway - I nearly got pulled over my my friend's little scrap of a terrier because I'm just not used to a dog who suddenly takes off as if they weren't attached! And as for Houdini - he couldn't escape out of a paper bag. This is the dog who once got stuck in the kitchen because I'd left a mop bucket in the doorway... I have to be careful how I play with him now. He pulled a tug toy out of my hands the other day when he wasn't expecting me to let go, recoiled backwards, and his back legs collapsed under him. When he got up he gave me such an evil look and wouldn't come near me till I'd apologised profusely and given him treats to console him.