First, lets look at what these two are wearing:
areas. bite the trainer.
Notice that they are also carrying a pole device with a rope hoop on the end. This is a Dog Catchers Lasso. This is used to catch dogs by putting the hooped end over the dog's head. The other end of the pole are the ends of the rope which they pull on to tighten the hoop. This isn't to strangle to dog but to restrain it and to maneuver the dog into either a cage or van. Seeing how the commandos brought a cage with them it seems obvious what they intended to do.