Ah but the problem with dogs is that for every decent dog owner who has a properly trained dog under good control appropriate for the situation, there are several who do none of the above and whose dogs are at best an annoyance and at worse actually detrimental in terms of either hygiene or actually biting people. It's the irresponsible spoiling it for the responsible really. I have nothing against well trained well cared for dogs with considerate owners, regardless of my personal feelings about being around dogs in places XYZ, but sadly it's too hard to legislate and enforce rules that make subjective judgements (and of course if people don't agree a certain type of them kick off).

Smoking is in my view a little different because it is not physically possible for even the most considerate smoker to have control over where their smoke goes unless they are in a confined area devoid of people who don't wish to breathe it in, and trying to make any public place so, while protecting workers, is tricky and probably too complex to legislate and police effectively with too many ifs and buts; hence the blanket ban we now how I suppose.