This is the 400% Bearbrick - Unagi Inu (Fujio Akatsuka) by Medicom Toys.
Medicom toys want you to meet the Unagi-Inu Bearbrick. Unagi-Inu means "Eel-Dog" in Japanese, and he is a character appearing in The Genius Bakabon and as part of Akatsuka's Star System. As his name suggests, he is a crossbreed between a dog and an eel.
The 400% Bearbrick - Unagi Inu (Fujio Akatsuka) by Medicom Toys is a limited edition.