In reply to Al Evans:
SPOILER ALERT!
Years ago, having read the Plague Dogs on my own, I decided to show the film to a class of 12 year olds for their Xmas treat. Without watching it myself first.
Now, in the book's final pages the dogs are swimming across Morecambe Bay in a desperate bid for freedom, on the verge of drowning, when they are rescued by Sir Peter Scott, out birding or something.
You can imagine the last five minutes of the film, dogs swimming and just about to go under, room full of kids snuffling and sobbing, me miming to the poor little heartbroken sods "It's OK, it's Ok, they'll be Ok!"
Then they drowned.