Indeed, since when did it become acceptable to take pets out to defecate in public areas and expect others just to accommodate this? If you want a dog, surely you must have private garden, otherwise this is an animal welfare issue. That garden is the dog’s toilet, nowhere else. Outside of your property the dog is on a lead, except in dedicated areas not commonly used for human recreation. Only guide dogs in pubs and restaurants. You need to pay to take a (non-guide) dog on a bus or train, just like children. That's what civilised countries do.
John Hall ● 6d