Look what I found on youtube:
This film is based upon a 1977 novel by Richard Adams.
The ending of this film is quite depressing, but the novel ends with the dogs being rescued by Ronald Lockley (who wrote The Private Life of the Rabbit, which Adams uses as his “scientific reference” for Watership Down, his most famous novel) and Sir Peter Scott ( who was a Conservative conservationist, ornithologist, naturalist, and Loch Ness monster hunter who was the son of Robert Falcon Scott, the Antarctic explorer). The dogs are returned to Snitter’s owner.
The film isn’t quite that sunny.
My favorite character is the Tod, a wild fox who speaks Geordie. He’s quite crafty, and amazingly, he teaches Rowf and Snitter how to kill their own food.