Digby is a dog that accidentally is fed with some plant growth boosting chemicals developed by the British military to be used on interplanetary cruises, and about the young boy, Bill, who owns Digby.
Digby is given to Bill by a friendly vet, but as Bill's grand-dad doesn't like to have an Old English sheepdog in his house, Bill is forced to give him away. He gives anonymously Digby to a guy who works in a defence lab, that makes experiments with animals and plants for coming space travel. A growth-boosting chemical is made in the lab, and the animal trainer steals some to boost his own tomato crop. Accidentally the dog is fed some, and as a result is growing all the time, eventually he's the size of an ocean liner.
As weird animals are attractions Digby is stolen by two well-dressed (mafia-style) hoods and sold to a circus, from which Digby escapes, hunted by the military, both army and air force!
The tone of the film is friendly, where all the evil guys are bumbling fools - the British Army lads, as well the Mafioso, and everyone is polite and no swearing! Typical for a family film, I guess!
That it keeps its pace, without much of a plot, and that the trick filming usually is pretty good (outstanding for its time, I'd say - most of it), and that it makes you laugh is worth much in my book - that it is 100% 70's (music, dressing, hairstyle, et cetera) makes it very, very camp!
A good family film with a lot of slapstick scenes! A perfect feel-good film!
Compared to Stuart Little 1 it wins hands down!
Available on DVD, by the way!