There are an estimated 13.5 million dogs in the UK (2024.) If they were all crapping on pavements and not being cleaned up after, we really would have a problem. The by laws are crystal clear, clean up after your dog or you could be fined. Sadly, a minority don't and I hate seeing dog poo on our pavements and I'm a dog owner. If you see it happening, politely ask the owner to pick it up or report them.
And let's not pretend human beings have a whiter than white track record for keeping the streets clean, that's why the councils employ street cleaners. It's also why beaches have regular cleaning sessions to pick up cartons, bottles, nappies and all kinds of other discarded rubbish which could harm marine life.
In regards to aggressive dogs, dogs jumping up or dogs generally being a nuisance in a public place, this is covered in law under the Dangerous Dogs Act. Irrespective of breed, it is an offence to allow a dog to be 'dangerously out of control' in a public place. It doesn't have to involve aggression but clearly a large breed of dog jumping up at someone could cause them to fall over and injure themselves. Call the owner out on it because this is a training issue and it's fairly easy to address.
I do agree with those who have posted about the new fad for 'menacing' looking dogs. I'm accustomed to large breeds but if I saw one of those, muzzled or not, heading towards me and my dog, we'd be doing a swift u-turn and getting as far away as possible.
It's a complete mystery to me why anyone would want to own a dog that looks like it's on steroids and much worse than that, has highly questionable breeding. It's insane.
Please remember than in addition to the millions of dogs who provide love, loyalty and companionship to their families, there are thousands of service dogs for the blind, the disabled, for those with epilepsy, cancer detection dogs, drug detection dogs, search and rescue dogs, police dogs, prison dogs, explosive dogs, etc