The official origins of the bull arab are 50% ebt, 25% german shorthaired pointer and 25% english greyhound. But it would be foolish to think the different lines don't have influences from other breeds, some openly do, and the rest almost certainly do too. This pups dad was very big and solid, about 55 kgs with a very boofy head, and that's not uncommon for bull arabs. I'd say such dogs almost certainly have some bullmastiff and probably dane in them, just a little. On the other hand after 30 years evolving as bull arabs it is possible they've just gotten bigger. Bully greyhounds can also be 55 kgs, and while they're not pure ebt x greyhound the other breeds known to be used aren't large- airedale and apbt. They just got big. This has happened to bull arabs as well, but yeah I think at the same time a lot of lines have bullmastiff and dane in them (and some others have bloodhound, and some have australian cattle dog, etc).