For those who cannot get enough iDogs, there is an iDog Capsule Toy line.
The iDog Capsule toys come in six colors. The tiny iDogs have a little chain to connect them to keys or other things. See all iDog Capsule toys on this Sega page (Japanese).
The 'big' white i-Dog is in stock again on Amazon.com for $29.99. Shop for i-Dog Accessories.
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