Old Yeller ftw
Greyfriars Bobby comes a close second place.
I cry like a girl every time I watch either of these. I'm a sucker for Lassie too - and Black Beauty.
And I've just admitted that on the internet...

edit/
*reads Kaol's & SLVA's posts*
*runs away crying*
not really, just nipping out for a ciggie
( Tourette's ( . )( . ) has a monkey hair in her fried egg, Tue 7 Jul 2009, 17:06, 2 replies, latest was 16 years ago)

You remember the movie Old Yeller?
You remember when they shot him in the end? I didn't cry! Now come on!.
(b3tamax Mate, you're fat and I'll throw you in the river, Tue 7 Jul 2009, 17:11, Reply)

I cry buckets every time,
then sing the theme music for weeks afterwards, welling up when "best dog gone dog in the west" goes through my head.
( Tourette's ( . )( . ) has a monkey hair in her fried egg, Tue 7 Jul 2009, 21:21, Reply)

You seen the Plague Dogs?
80s animation? *weeps*
( Roota zweeeeeoooooowm, Tue 7 Jul 2009, 17:32, Reply)

I saw the animated film of Watership Down, which was a travesty of the book.
I read The Plague Dogs and cried throughout for Rowf and Snitter. Didn't know there'd been a film version. If that's your cup of tea, you might like to read Shardik (also by Richard Adams) who is a bear.
( Tourette's ( . )( . ) has a monkey hair in her fried egg, Tue 7 Jul 2009, 21:26, Reply)