First, a spoiled boy. In real life, there are many male chauvinists. They fall in love with girls and seldom act coquettish. They only like their girlfriends and themselves. Boyfriends who can be called little suckling dogs are all boys who like to spoil their girlfriends in daily life. He doesn't see any male chauvinism in them. When quarreling with their girlfriends, they will behave like little suckling dogs, hoping that their girlfriends will forgive themselves. Such a boyfriend is very dependent on his girlfriend. They want their girlfriends to be with them anytime and anywhere, and they also want their lives to be self-centered. Little suckling dogs don't lose their temper in love, but just like to stick with their girlfriends.
Second, a handsome boy younger than himself. Little suckling dog's boyfriends are younger than girls, so girls think such boys need to be pampered by themselves, so such boys are called little suckling dogs. Boys who can call little suckling dogs are very handsome, which makes us feel comfortable at first sight and everyone likes them. Most girls have the final say when they fall in love with the little suckling dog, because the little suckling dog will listen to his girlfriend's arrangement and will not make decisions without authorization. In my impression, boys who are called little suckling dogs are all very white, and girls will like such boys inexplicably.
The name "little suckling dog" originally meant that aunts like to love beans, and it was not until recent years that this name was used by everyone for boyfriends. Little suckling dog is not a derogatory term, but a saying that her boyfriend is cute and relies heavily on her girlfriend in her daily life.