Your dog is high in Prey

This simply is the desire of a dog to chase something and bite it. Not because he hates wheels because his eyesight key s on motion. Be it what you mention, it can be dangerous. Its a natural drive for dogs to have.

Solutions for Aggressive Dog Behaviour-Prey:

Since this dog behaviour is the act of running away from you to chase whatever it decides, you need to focus your dog training towards the "leave it" and "come" commands. "Leave it" training teaches your dog that he is not allowed to show interest in whatever you, his handler, decides. Birds, cats and rabbits would be a few examples in addition to people,wheels etc, as mentioned above.

Teaching your dog to "come" or recall, gives you the ability to call your dog back to you when he starts to chase something. A dog will have to be really, really solid at this command, especially if he has already started to pursue something or someone when you are trying to recall him.

How long you must work on these will be depend on how high your dogs drive is. It may take some time and patience but if it is a child your dog decides to bolt on, it is well worth the extra work.