This really is the bargain basement of film making with duff acting, duff effects and duff props. The dog is by far the star performer in this film. The dad has to be one of the worst actors in film history. He likes to show off his shining teeth and comes out with some inane dialogue delivered in a wooden way. I reckon the script writer was drunk unless they made it up as they went along. The cheapness of it is emphasised by the fact that they include (not very well) stock wildlife footage at various points. This was obviously not taken for this film and is very badly edited in. Even late 70s audiences must have been struck by how basic, cheap and amateurish the whole thing looks. The dad believes it isn't uncommon for humans to have 6 toes. Really. I have never heard of a single case although I suppose it is possible but is certainly not common. They probably spent about 10 minutes knocking up the script, 5 minutes maximum rehearsal and 15 minutes cobbling the whole mess together back in someones front room. It is comical but I don't think it is supposed to be a comedy. It is watchable though simply because it is so bad. Films with much higher budgets have been as bad or worse. However, back in the late 70s it is hard to imagine any adults or kids who would have found this worthwhile.