Chikuwa is Ena Saitou's dog. Chikuwa appears to be a long-coat Chihuahua. Usually this breed of dog does not get much protection from the longer hair in cold weather, so often requires a coat while outdoors during the winter.
Chikuwa has long coat white and fawn color fur.
The dog seems to be energetic and likes to walk, not to mention hates cold.
- Chikuwa looks suspiciously like a similarly named Chihuaha on Youtube: チワワのちくわ cute Chihuahua Chikuwa
- Chikuwa is clearly a Chihuaha in the live-action drama.