Yes the tree is a dwarf but that does not mean it will only get 5 foot tall. It only means that it is less than standard. Standard trees can get 40 or 50 feet tall.
A little pinching of the top leader at about 10 or 12 feet should cause it to branch out and spread a little more and have a little less height but don't over do it with pruning avo's. BTW it is an "A" type flower and although the tree is a bit smaller, the fruit is quite large. There is some speculation the tree is not a genuine dwarf but rather that it puts so much into fruit production (good producer) that it just doesn't grow as tall as fast.