hi, i have 2 dogs; a 9 year old beagle terrier, and a 15 month old beagle rat-terrier. the elder one loves to chase tennis balls, and the younger one is obsessed with his lacrosse balls. the problem is, my 56 year old father is the one who plays alot of the time with them while he works in the yard and he throws the balls for them and such. but he has arthritis and cannot do it more than a few times without being in pain. my question is, are there any devices out there capable of launching a tennis and a lacrosse ball 30-40 feet? thanks