Kingda Ka became the tallest and fastest roller coaster in the world, taking both world records from Top Thrill Dragster at Cedar Point. It lost the title of world's fastest when Formula Rossa at Ferrari World opened in November 2010.
I want to know as much information as I can about puppies, since we'll be fostering pretty soon. Someone said (not on Dogster) that they should start wearing breakaway collars at 4 weeks.
There is no proof that they produce better results than old fashioned training methods. It is just a sign of a bad/ lazy owner. It is riduculous to expect a 19 week old puppy to be fully trained. Use of the collar will do more harm than good.