We have a red inflatable horse from this company that we bought a few years ago and it's one of those toys that we use every day. Both kids love it but my oldest is growing up a bit to really enjoy it to the fullest. He chose this one. His size is in the 4th and 90th percentile and I would say that size is close to perfect. Lots of room to grow and use, but not too big for him. If I were buying for an average height 3 year old I would definitely choose 15 inches. For the younger ones I would recommend the horse form. red horse (feels like thick vinyl). It seems sturdy enough, but I don't think I'll be using it outdoors. It's worth the price (about $10).
WALIKI Red Hopper Ball For Fun And Therapy: Jumping Hippity Hop For Ages 16-101 (29"/75CM)
39 Review
Get Your Kids Hopping With WALIKI'S Green Hopper Ball For Ages 3-6 Therapy And Fun!
37 Review
WALIKI Toys Kids Hopping Ball With Handles - Bouncy Ball For Sit & Bounce Fun - Hippity Hop Ball, Kangaroo Bouncer, Jumping Ball - Pump Included - Red - Ages 3-6 (18"/45CM)
29 Review
Plush Stick Horse Toy For Kids And Toddlers By WALIKI Toys
30 Review
Unicorn Little Girls Makeup Kit - Real Washable Makeup, Powder, And Lipsticks For Kids Toddlers, Perfect For Princess Birthday And Christmas Gifts
18 Review
Fun And Safe Playtime With PlayMaty 100 Colorful Pit Balls For Kids
30 Review
Dynamic Movement Sensory Sox For Kids 6-9 Years - Updated Version, Medium, 47''LX27''W Green By Sanho
22 Review
Revolutionize Playtime with π Click Play Phthalate Crush Plastic
9 Review