I actually quite like dogs and would one day like to have a dog (life is too busy for that particular commitment at the moment).
However, I am also tired of being regularly harassed by poorly controlled dogs and coming across dog shit everywhere. My 2 year old has become anxious around dogs because of several experiences of being chased, knocked over, or run around in circles by reactive, barking dogs over whom their owners have no control. Not only in parks or fields or even woods, but mostly on footpaths in residential areas (because that's where we do most of our walking). I am not exaggerating these kind of things happen every few weeks and in one particularly bad week there were 3 incidences in a single week!
She now stands against me facing my legs whenever she sees a dog because she is afraid. She is not able to understand the difference between a controlled non reactive dog safely on a leash and one that is unleashed and might run over to knock her down or bark in her face. I don't even discourage this response because frankly it is safer for her.
Thankfully where we live large dangerous breeds are not popular. This behaviour is mostly from terriers, spaniels and sometimes medium sized retriever types.
At a beach or out on a woodland walk if we have a picnic it is not uncommon for dogs not on a leash to hassle us for food or even steal our food whilst their owners fail to recall them because they have not been properly trained.
And I see discarded bagged dog poo, or unbagged dog poo every day. On footpaths, thrown into our front garden (!), in fields / woodlands and natural areas.
Lastly there is a problem where we live of under exercised bored dogs locked in small gardens who reactively bark at everything and anything. To be honest that's a minor nuisance but it's the poor dogs I feel sorry and upset for.
It's true - this isn't the fault of dogs themselves, they are animals governed by their instincts and training. It isn't all or even a majority of dogs. In fact, the good behaviour of most dogs makes these bad examples even more annoying because they are so unnecessary if a dog is either well trained or controlled on a leash!
But there are a lot of irresponsible owners out there and I think the problem has actually got worse or is more noticeable as dog ownership has increased. I believe owning a dog is a major commitment to a certain kind of lifestyle which should include its training, exercise and also managing its waste. If you don't have the time or don't want the commitment, you shouldn't own a dog. I am in favour of dog licensing.