"A Werewolf Boy" was my first tearjerker. Both movies have gone into my collection of movies that make you cry. They are both beautiful, everything the guy did he did for the girl, and it makes you long for men like that to have in life although Koizora was based off the writers real experience. I would definitely suggest making a "Movies that make Me cry" collection with these 2 as the first to.
'Dog' turned human romance story. Chul Soo (Song Joong Ki)'s character is like a wolf that suddenly gained a human body [yes he is a werewolf but this is how his character acts] where Shiro (Toyokawa Etsushi) is shown to be a guide dog given a human body to find the girl that raised him as a puppy. If you liked one you'll probably like the other.