The ending in 'Snowman + The Snowdog' made me cry more than this.
I love both films, they're adorable and this type of animation is so engaging, a rarity.
However, when watching 'snowdog' at Christmas, I cried quite extremely (I'm hesitant to admit :P) because we as the audience are naive to think it would end in any other way, the snowman always melts. It was beautiful.