Every man and his dog.
Every man and his dog.
The phrase 'Every man and his dog' is a humorous way of saying that a place is very crowded, or that everyone is present. Consider a small community event where you expect few attendees, but instead, it seems like every resident and their pets have shown up. This expression is often used to emphasize surprise at the number of people (and sometimes pets) at an event, indicating that it's more than usual or expected.
Every man and his dog showed up at the concert.
A large number of people attended the concert.
It felt like every man and his dog was at the beach today.
It seemed like everyone was at the beach today.
With every man and his dog crowded inside, it was hard to find a seat.
With a large crowd present, finding a seat was challenging.