They aren't worried about being charged because they don't think their dog would hurt anyone.
The reality is that there are lots of dog laws that are openly disobeyed with little action because there is a lack of will to enforce it.
For example dogs are routinely sold with cropped ears, found without microchips, puppies openly sold without the mum present, dogs off lead where they shouldn't be
These things have been illegal for years but no one cares really. How often do you see people smoking weed openly in the street, or openly drug dealing? There's a huge chunk of society that lives outside of law enforcement
Most people insure their cars because it flags up on cameras, there's no such thing with dogs
As a responsible owner, my dog is pretty traceable. There's kc registration with parents or her adoption records, her microchip, vet records, vaccine records, insurance, local trainers and dog groups that know us. We are frequently walking in dog areas where should there be for example some mass checking of microchips by airport style security we would be found. My dog exists on the " system"in some way
This dog was illegally rehomed at least. Neigbours report theyve not seen it walked. There's likely no record of its birth, it's possibly not microchipped or having appropriate vet care.
It likely doesn't exist in a paper work way