it really depends on the bloodlines , is your dog actually an american bully? bullys can be all different sizes and weights if you check out the ABKC website it explains the different classes. most all bullys will not fit the ADBA standards but its a good registry if you want to do something like weight pulling. The UKC standards allows some bullys to fit in there , mostly classic style but even then it really isnt meant for the bullys. The ABKC is the best registry for the american bully if your dog doesnt fit into the standards as a show dog you may want to consider the idea that its just not a show dog period , not every dog is going to be a show dog. However saying that does not mean dont try , getting your dog in the ring is great experience for you and your dog and who knows maybe the judge will like that look , just dont go in expecting anything and you have nothing to lose. Fun shows are another great way to get the same experience but maybe fit in a bit better and most are a bit cheaper to enter as well. other things you may want to consider is doing some sort of event with your dog , something that isnt judged on looks and conformation. examples of this are things like obstacles , obedience trials, weight pulling, dock diving, flyball, or get into therapy work or work on getting a CGC there are lots of options for doing things with your dog even if he/she doesnt fit a standard.
at 9 months though your dog still has alot of time to grow and fill out , I know one of my girls was a late bloomer and didnt start to fill out much until after a year ,so you really dont know what you could end up with. every dog shown in the ABKC until a year old is shown as a standard with dogs of similar age , so get her in the ring now its a great start if you can do it early and get her used to the crowds, and dogs and noise now rather then later.