saw Marley & Me once.. will never watch it again..
we had to do the same thing with all 3 of our dogs in less than 1 year (2007)... all 3 of them died within 8 months of each other (14 years old, 11 years old and 17 years old).. that was one of our worst years ever.. we are HUGE animal people (although we only actually have dogs as pets), and that movie brought back so many memories of having to go through putting down all 3 of our dogs in quick succession, its one of those things that you just have to watch once, but never want to actually see again.. the final scene literally brought my wife and i to complete breakdowns.. i didnt even really care much for the rest of the movie (although the time when Marley put her head on Aniston's lap was pretty sad too)
same went for Hachi.. depressing as fuck.. glad we saw it, love the story, could never watch it again