Dog Racer vs Cat Racer: Which Tamiya Kit to Choose?
Dog Racer 18086 and Cat Racer 18090 are closer mechanically than their different characters suggest. Both are full Tamiya Racing Mini 4WD assembly kits on Super-II chassis, both include a motor and 5:1 gears, and both need two AA batteries supplied separately. Choose between them chiefly by the figure, body and supplied wheel-and-tire appearance. Tamiya does not publish a controlled test showing one is faster or easier to build. This side-by-side guide focuses on what actually changes when you pick one box rather than the other.
Same mechanical platform, different characters
Dog Racer is Racing Mini 4WD Series No.86. Its painted and assembled Shiba-inu driver sits in a white, single-seat buggy-inspired shell. Tamiya even includes a stylized version of the Chinese character for Shiba among the stickers. Cat Racer is Racing Series No.90, with a preassembled and painted cat in an open-top buggy body. Its stickers include fur-inspired patterns as well as logos. These figures and decals are not loose afterthoughts: they are the visual reason many builders choose an animal racer.
Neither character turns the kit into a different class of toy. Both are motor-driven Super-II Mini 4WD machines assembled from parts. If you are buying a first kit for someone attracted to a character, allow time for normal chassis assembly rather than expecting a pullback car straight from the package. Tamiya's product photos show painted finished examples. The first-build guide helps with tools and the order of work without repeating the instructions printed in each box.
The actual color and tire differences
| Stock feature | Dog Racer 18086 | Cat Racer 18090 |
|---|---|---|
| Chassis | Light-green Super-II with white fittings | Blue ABS Super-II with white A parts |
| Wheels | White V-spoke | Yellow V-spoke |
| Tires | Large-diameter narrow arched | Light-blue large-diameter arched |
| Published size | 150 × 97 × 45 mm | 150 × 97 × 50 mm |
| Kit gears | 5:1 | 5:1 |
The five-millimetre stock height difference reflects the finished kit with its character shell. It is not a lap-time result or evidence that the taller cat will fail a race inspection. The published length and width match. Tamiya describes both tire sets as arched and large-diameter; Dog's are specifically narrow, while Cat's color is light blue. Build with those supplied sets first if you want to know how the products compare before making other changes. Once wheels, tires or motors change, you are no longer comparing the two stock packages.
What to check during the first build
The chassis assembly follows the Super-II approach for each car: motor at the rear, shaft drive to the front, rotating-switch rear stay and a body that clips into position. Lay out the look-alike wheel and chassis parts separately if building both as a pair, so the yellow Cat wheels do not end up on Dog by accident. Seat the axles and gears, spin the wheels by hand, install the body, and make sure the animal figure does not get pressed while clipping the body down. A correct stock build matters more than a speculative claim that one character body has better aerodynamics.
If you later add rollers or stays, inspect clearance around the figure, ears and cockpit with the body fitted. Do not assume a part chosen for a low Fully Cowled shell will clear these taller sculpted bodies. The Super-II chassis guide covers platform tuning. The broader animal-racer guide covers four characters and discusses body-inspection questions if you intend to enter a regulated event.
Which one should you buy?
Choose Dog if the Shiba-inu driver, white buggy and light-green chassis are the appeal. Choose Cat if you prefer the cat figure, blue chassis, yellow wheels and fur-pattern graphics. The core 5:1 Super-II build does not force a performance recommendation either way. You can also build them together as a visually matched pair and learn how different shells and stock tires feel without treating the pair as two chassis families. Buy the exact kit through Dog Racer 18086 or Cat Racer 18090; each listing shows its own live availability.
Frequently asked questions
Are the drivers already painted?
Yes. Tamiya describes both animal figures as preassembled and painted, while the rest of each car remains a kit to build.
Does either box include batteries?
No. Both official pages call for two AA/R6/UM3 batteries separately.
Is one kit faster?
Tamiya gives both a motor and 5:1 gears but no controlled stock-versus-stock lap comparison. Choose from the verified package differences.
Sources checked 26 September 2026: Tamiya Dog Racer 18086 and Tamiya Cat Racer 18090.