It's Nintendogs with a little more personality and a few mini-games. It's cute, it's a good time killer, and it did make me look to eBay for one of the robot dogs that came with the title. It's a strong DS curiosity, but otherwise it's exactly what you'd expect from the pet-care genre.

Also you transfer Wappy's heart from your DS to the toy to switch modes...so does that make Wappy a heartless when I'm in travel mode? Food for thought...

This game is packaged with a robotic dog, which the game can interact with the dog via beeps and barks. There is also an in-game 3D Wappy Dog, that doesn't require you turning on the robotic dog. You can play with the dog, feed it, customize it, and make it do tricks. There are mini games as well, which help you unlock options.
Wappy Dog was released in Japan as Heart Energy Poochi, extremely similar to the Poo-Chi dogs from 2000, both Poochi and Poo-Chi were handled by Sega Toys in Japan.