My feelings are that they are the top canine athlete out there. They have the most admirable traits a dog can have. They are exceptionally strong for their size and extremely determined. They tend to be pretty easy to train (depending on bloodline) and can also be very smart thinkers. But their determination and love for play can sometimes get them in trouble. They can be stubborn in certain situations, great escape artist and hard chewers. They are a very capable breed of excelling at many task, they can do almost anything any other breed can do, even better sometimes. They make great family pets when bred and raised correctly and adore children. They can sometimes be dog/animal aggressive depending on breeding and raising. They are certainly not a dog for the casual dog owner in most cases. There is also a lot of varience in the breed due to a lot of fad & bybs.
The APBT & the AST are generally different. The AST is the AKC version of the breed and bred down from the APBT from lines such as Colby, Tudor, Clark, ect
The Staff is a refined show breed that has gone through many changes over the years while the APBT has remained mainly a performance/working dog. Although there are APBTs that are bred as show dogs and house pets galore the show standard for the APBT is based on what the ideal working dog should look like.
The Staff has gone through a great evolution (as most AKC breeds) in which it has been changed from the original APBT into one of another appearance. Even the modern staff appears different then the original staffs.
old Staff CH
newer staff CH
modern staff GR CH
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The AKC staff is generally very typy, slightly larger, thicker boned and heavier set then the APBT. This is in general as the majority are like this, but their is exceptions of staffs who are still very light and more resemble the orginal staff/APBT rather then the modern staff.
There are also many AST registered with the UKC as APBTs and being bred as APBTs, this has caused a lot of the UKC dogs to have a heavier staff type appearance. So yet another evulotion here, of what used to be considered the standard and what is now considered the standard. The actual written standard has not changed but what the breeders are breeding and judges putting up has. But you can see a huge difference from one dog to the next, you might see a UKC CH that looks staff type and see a UKC staff that looks like game pit type, just depends on who is judging Staff Judge or Old School Pit judge.
Then their is the ADBA APBT in which the dogs are still being judges closely to the original standard, where the dogs look very similar to the original APBT keeping them traditional. However the ADBA does except UKC and AKC registered dogs into its registry. However this does not mean the AST would place in the conformation ring.
The AST is infact the same as an APBT by breed, genetically they are the same and the AST has had no other breed added in, however they are 2 very different types of the same breed, this can also be seen in other breeds.
Besides all these their are also different sects within the breed.
The are the AKC/UKC AST show breeders
There are the Fad breeders-these breeders breed xl dog for size/color/$$. They are selling to those who want an APBT to look intimidating and big/bad. They are often a mixture of Staff line, APBTs line, and other breeds such as Neo Mastiff, Bull Mastiff, Dogue De Bourdeaux however they have hung papers and are still registered as APBTs. Like Muglestone/Greyline/RazorsEdge/Camelot lines (A lot of people however are not reffering to these dogs as APBTs but rather American Bullies)
There are the larger weight pull breeders-these breeders breed xl dogs for their ability to pull and large size. These are often mixed with Dogue De Bordeaux, Bullmastiff, American Bulldog, Presa Canario, ect these are like Whopper or Dagger lines. (Again while these dogs are still registered as APBTs they have hung papers and are now being called by a lot of people including their creators Oklahoma Bulldogs)
There are the show breeders who breed show dogs to the working standard and often times even working these dogs in UKC & ADBA competitions as well as outside activities.
There are working breeders who breed dogs for working only and let form follow function, they tend to have a bit more varience in the look of their dogs. While they care about proper structure (don't want weakness when working) they do not breed to make a show CH quality dog, only one that has a temperament to excell at work.