I did a little research (looked at Wikipedia) and found out that Velociraptors as depicted by 'The Berg' in Jurassic Park are inaccurate. These creatures that caused you to have a nervous breakdown when you were 9 seeing this in the theater for the first time are not as dangerous as seen in film. A real Velociraptor, V. mongoliensis, is only about the size of a large turkey. Weighing up to 33 lbs, and also covered in feathers. *See photo below.* I'd still err on the side of caution when dealing with V. mongoliensis. Don't try feeding one of these little bastards half of your tuna sandwich. But with even lower than average agility and skills, I'd suspect you could still fend one off without any real threat to your well-being. Kick a soccer ball at it or maybe bang some pots together and that should probably be enough to scare one off. Don't be blinded by arrogance, however. It will kill your cat, or even a smaller, wimpy kind of dog.
That said, the Velociraptors 'The Berg' based his dinos off of in Jurassic Park were a larger relative to the inferior turkey-raptor. They are called Deinonychus antirrhopus. These guys weigh in at over 160 lbs and I'm pretty confident that one of them, or if it's true they hunt in packs (yet to be proven), could easily own you. Geological evidence suggests that Deinonychus inhabited a floodplain or swamplike habitat. So unless your some kind of jerk that lives in a swamp, you're pretty safe. But if you are that jerk, and someone starts building a new condo community and in the process kills some baby Deinonychus and forces the other now severely pissed off Deinonychus out of their home on a rampage of revenge into your back yard, you're fucked. I've included a image with a scale for reference below.
I hope this information proves useful to you. Good luck.
