LOS ANGELES — Fifteen dogs attended Sue Subkow’s first Halloween party in 2005. Half wore costumes, half were naked and all went home in about an hour.

The next year, turnout doubled — this time with a potluck, “Pooch Parade” and awards ceremony. Today, her San Diego Golden Retriever Meetup Group includes more than 1,000 dogs and as many as 80 show up in costumes for her Halloween party.

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