Dogs that are 'huge and an intimidating breed' should ALWAYS be on a lead in public spaces like parks. How selfish to let them run off lead! Why assume everyone knows they are harmless and well-trained? Many people are nervous or afraid of huge intimidating dogs, ir is utterly irresponsible to excercise them in a public park. If you don't have private land to exercise this type of dog, and are not prepared to keep it leashed and muzzled in public, you should not own it. Yet you let them run around, where small children are playing? If they did attack someone, would you have the physical strength to pull them off?
As others have said, dogs are pets not citizens! People pay taxes towards maintaining parks and green spaces, why should we be deterred from using them because of big intimidating dogs running free?
It's ridiculous to say 'just walk past it' to someone who is scared, particularly a mum with a baby. I don't know your dog and I'm not going to take any chances! I'm not going to squeeze past him on a narrow path or let him get within snapping distance of my baby. How do I know he won't show any interest? I want you to keep him a safe distance away, eg a metre, in case he tries to jump up at the pram. If that means you stop and hold him, or step off the path to let someone past, you should do it!
And TBH if he's a big aggressive-looking dog I will have switched route before we reach you, even if that means I have to leave the path, cross the road, push pram up a muddy bank etc. To me a large aggressive-looking dog is just as scary as a lion, both have potential to attack.
I have no issue with assistance dogs, in fact I like stroking the therapy dogs when they come into work. I know they are calm and well-trained and not about to snap. And I enjoy playing with my friend's dog, who I've known since she was a puppy. But I don't trust strange dogs and I don't want them anywhere near me! Your dog may well just want to sniff my legs, how do I know he isn't about to bite?!
As for other animals- horses are not allowed on footpaths or in parks. I wish dogs were also restricted to the bridle ways. I ride but always keep to one side when passing people on foot, or if the path is narrow I stop to let them past. Imagine the chaos and danger if horses were allowed to roam freely in parks, chasing each other and charging at people in play!