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Not just by its shape but also by finding that it is very comfortable for them to sleep in.
The fact that it is washable makes it even more attractive.
The size is 20 x 20 x 6.3 inches outside
The inside is 18 x 18 x 6 inches.
These numbers show that the bottom is almost 1/2 inches thick and it also has a bottom that is non-slip.