I think you should ask yourself the real reason why you got rid of Jazzy and the reason you want a new puppy 
 
 
It does sound as if you only enjoy the "fun" stage and that once they are adult you find yourslef getting bored..This isnt fair.You got rid of Jazzy,so I cant even imagine why you are even looking into getting other! It may seem ok to you,but it seems sefish to me 
