Measure from nose to base of tail. Add 5–10 in (12–25 cm) for stretch.

Sleep style matters:


Cuddlers → donut/plush beds; pick the snug diameter.


Sprawlers → rectangular/bolster beds; pick the next size up.

Guides:


Small: up to ~16" (40 cm) diameter — kittens, toy breeds


Medium: ~20–24" (50–60 cm) — most cats, mid-size pups


Large: ~28–36" (70–90 cm) — big dogs, multi-cat snuggle zone

(Adjust sizes to your exact product options if needed.)

Kittens/seniors: 30–45" height for easy climbs

Active cats: 50–65" with multiple perches + sisal posts

Multi-cat homes: 65"+ with wide, weighted base

Tip: Pick a base that’s wider than your cat’s shoulder width for wobble-free zoomies.

Post height should be at least your cat’s full stretch (nose-to-toes when reaching), often 26–32".

Look for tightly-wrapped sisal and a heavy base so it doesn’t slide.