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The DDA check is just measuring the dog and seeing if it fits the mould they have of what a pitbull / dogo argentina etc look like, it's not exactly a holistic investigation in to the genetic make up of the animal.
In this particular case you've got a dog which is from a breed already very closely related to the pitbull from unknown parentage, if given the chance wouldn't you want to know if you've potentially got more than you bargained for?If a dog is well behaved and has shown no signs of aggression over an extended period do you think an experienced owner should put in new safety measures (muzzle) if they found out it had a dangerous/banned breed in them?
In a word yes. Pitbulls themselves are known for "snapping" when they reach maturity, there's many, many news articles about the family pet that they'd raised since a puppy one day just deciding to attack it's owner or other family pets after 3+ years. The problem with pitbulls and fighting dogs is they don't growl or show signs of aggression to warn you off, they just attack and don't stop until the thing is dead. If you have a dog that comes from a line of fighting dogs you need to be hyper aware and not put them in a situation where they can do harm.
Here's a little bonus article, we all know dogs that look like those in the picture. Call me when someone posts a similar article and the photo is of someone leading away a Cockerpoo.
https://metro.co.uk/2021/06/10/norwood-park-blind-family-dog-dies-after-being-mauled-by-pit-bulls-14748264/
Sumo-
I know multiple Pits, they're pretty mellow. All are people friendly, most are dog friendly. If dangerous breeds were classified based on a risk assessment, then a bundle of larger protective breeds (and some smaller ones!) should be in there, GSDs and Malinois in particular. I volunteered for a couple of years at a GSD rescue and a solid proportion of the dogs in there were given up because of issues with people (let alone other dogs.) I don't pet any of those protective breeds without asking the owner (including ACDs!)
If you've seen a Jack Russell catch a rat, or a Greyhound a cat, the idea that Pits are somehow more murderously unstable seems a bit nuts.
Jung
Maybe i'm getting lost in all this but are you saying that regardless of the DDA check verifying the dog as safe, the owner should still take a DNA test to check if there are any banned or dangerous breeds in the dogs DNA? Are you also saying that it's important for an owner to know how much of a risk there dog might be (due to breed) regardless of the dogs temperament? If a dog is well behaved and has shown no signs of aggression over an extended period do you think an experienced owner should put in new safety measures (muzzle) if they found out it had a dangerous/banned breed in them? Genuine questions, not here to argue.
We've been considering a DNA test to see if there's any red flags but the advice from our animal behaviourist is that our dogs behaviour is not breed specific but rather a result of her poor treatment and focusing on the breed would not be helpful at this point.