In my experience, the bigger dogs, especially Labs and retrievers are the gentlest and best with kids. The smaller dogs are the more yappy and impatient ones. I have a golden spaniel now, and she is the gentlest sweetest thing ... she has never nipped anyone in her life, Even if someone steps on her tail or paw by mistake ... which often happens, as she insists on sitting so close to us all the time, she never snaps ... she just gives a little yelp, jumps away, and looks at us very sadly as though asking - "What did I do now?"
I had a Maltese a few years ago ... that one was like a spoilt baby! She would bark herself crazy when we left the house, she would be so angry that we were leaving her behind. And she was the only dog who was allowed on the bed ... mainly because we couldn't stop her from jumping up 😆 But despite her size, she thought she was a vicious fierce guard dog ... she would run at all the bigger dogs in the building ... they ignored her like she was some fly they couldn't be bothered to even swat!
OMG I love Golden Spaniels, they are just too adorable...those ears <3. Yea I find bigger dogs are more tolerant, we steps on my guy's paws all the time but he doesn't do anything about it. He was even patient with this lady who freaked out when he came to sniff her and slammed the door in his face (I however, was not as nice as him...she insisted on coming in when I kept telling her let me take him away if you are so afraid.) I find bigger dogs often ignore smaller dogs, mine doesn't, he forces friendship on them but he knows to stay away when the dog is looking to pick a fight. Our neighbour has one aggressive, not neutered bulldog, a complete maniac who I feel bad for her as he is obviously lacking training and they aren't giving him any exercise (I mean it's a bulldog...come on, they need the least amount of exercise.)
Anyways, my dog ignores him, but ever since he picked a fight, my dog has this habit of going and peeing on his favourite bush, which the bulldog goes nuts watching from his window and sometimes he will rub his feet to mark the territory. The reason some bigger dogs I find are afraid of smaller dogs is because they can get underneath and bite. I do love little dogs though! Just sometimes people don't realize that the smaller breeds have much more biting cases then any of the larger breeds. People are deadly afraid of my dog and to me (compared to my friend's 140-160 pound Caucasian Ovacharka) he is a wee little thing (65-70 pounds 😆)