Statista 

Whether you’re looking for a quick table to pop into your presentation, or need the actual data captured in an Excel spreadsheet, Statista has got you covered! Find market and consumer data, on over 80,000 topics, 170 industries and millions of statistics. 

Plus, Statista makes it easy to find related data! The page with the pet costumes included information about pet ownership, pet and animal supplies, Halloween, and pet treatment.

So, the only other question is, what did your pet dress up as for Halloween?