Boxers were EXTREMELY popular during the 30's. You can find all sorts of unique dog items from that era....if they are for sale!
My uncle has quite a collection of unique boxer items from that time period (after war) and was shocked when I researched them last year at the values $$$ of them!
As for this piece, it could be up to mid 40's. Would sell for $15 to $30 in my neck of the woods - depending on condition.
Wullie, would you like that hat on bread or just plain on a plate with some steak sauce? LOL