What Size Is Right For Your Pet?
Measure your pet lying down as he/she is normally accustomed to lying. Measure from nose or front legs, to back legs or rump and the add 9" to 12". Pick the size of bed that will best fit those measurements, remembering that round bed measurements are in diameter (width across the circle).
Using weight, with some judgment, use the following guidelines:
Small - pets up to 25 lbs.
Medium - pets up to 40 lbs.
Large - pets up to 85 lbs.
There are three rules of thumb often used to answer this question.
1. Measure your pet lying down.
2. Use the weight of the pet.
3. When in doubt get the larger, not the smaller size.