Strange little souvenir of Mexico, mid-century vintage. It's a china ashtray in the shape of a dog with a wide open mouth, measures about 3 1/2" x 2 1/2" overall.
I don't know how anyone could bring themselves to use this for cigarettes, but rest easy - I don't believe it's ever been used. Nice and clean overall, without wear.
What might the oddest thing about this piece is that it's almost certainly made in Japan, although it's stamped Souvenir of Mexico on the side. Bottom is unmarked, but so many Japan pieces were marked with paper labels which were removed or fell off years ago.