It means "For somebody's marriage street dogs are busy"
It means your sister/brother/children marriages, outsiders in marriage are too busy or behave like their own marriage which is unnecessary for them.
Where someone is paying a lot of attention to something that has nothing to do with them.
Suppose you won something, but your friend doing more RANTING than you do. Actually which in unnecessary for him to do it.
Note: while posting an English Proverb, no need to include dog, it is just saying in our language. But please make proverb which is equivalent to examples. Just forget about dog here.