the measurements for this are external......you lose about 4 inches in padding so it was too small. Gave it to a friend with a Chihuahua--perfect for her but too small for my 9 # Lhasa. I bought it because I like the removable cover so was disappointed by the actual size.
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Review 2 for Aspen Pet Antimicrobial Deluxe Oval (18") - Caramel/Stripe Chenille
The Aspen Pet Antimicrobial Deluxe Oval (18") appears to be well constructed. The removable cover is durable, easy to remove from and put back on the foam frame, and washes well. The zipper appears to be one of good quality.
Our small and medium-sized cats regularly use the bed. On occasion, the larger cats will use it, even though they sprawl over the sides.