Horse Party Supplies and Decorations - Horse Party Plates and Napkins Cups for 16 People - Horse Birthday Banner, Tablecloth and Centerpiece - Horse Birthday Party Decorations and Pony Party Supplies! :
Appaloosa Facts | Two Old Horses and Me
Heart My Horse Birthday Hats - Party Things Canada
Customized Birthday hats for dogs
Horse Birthday Hat - Etsy Canada
Kentucky Horse Derby Cone Happy Birthday Party Hats for Kids - Etsy Canada
Horse Party Hat Pony Party Hat Barnyard Birthday Farm - Etsy Canada
Horse Birthday Hats - Etsy Canada
40pcs Horse Birthday Party Decorations Horse Theme Happy Birthday Banner, Foil Latex Balloons, Cake Cupcake Toppers for Horse Racing Party Supplies, Balloons - Amazon Canada
Heart My Horse Birthday Hats - Party Things Canada
Sparkly Horse Birthday Party
TIL if you search for "horse wearing party hat" in Google images, it will return multiple images of horses wearing party hats. Here's one. : r/funny