DeeDee - You are so right with people thinking they are the dog whisperer.
People who have XL Bullies and similar seem especially prone to this delusional belief , and spout “Nanny Dog “nonsense that is complete myth.
These dogs are hardwired to snap out of the blue.
ANY dog can be unreliable but XL Bullies and similarly especially so .
I’d not trust any dog around small children.
Mia Derouen ( age 4) was slaughtered by her mother’s boyfriends XL pitbull - Police said it took 11 rounds to make it release her body.
The XL pitbull so say was “her pet” before it killed her.
Her mother said it flipped out of the blue.