Why are girls wearing dog collar, is it fashion?

sounds like either a fetish or extreme fashion style.

They're mindless and tasteless tramps who'll wear whatever cringe-y item is in temporarily. In a year or two they'll be embarrassed for wearing such garbage out in public but when it comes back in style in a decade they'll line up to publicly humiliate themselves and now their daughters who also inherited their low IQs and poor taste when they buy them again. Same with every vapid tramp of every era. But then they want to be respected and cry out feminism, lol.

because they can

its been fashion since the 80s

Something about feminism...

Like a choker