This is a great black and white film! I think I watched it for the first time when I was about ten too, but I was in a cabin by a lake in France and it was on the horror channel. I'm not messing around either, that's where I was. It was a fishing trip. I was there with my Dad and his friend and the owner of the lake had satellite or something in the cabin.
For a kid this film is scary. It's one of those black and white films that hits the nail on the head. The music is shrill and petrifying, it has great evil atmosphere, the masks the dogs wear are actually mind-ingrainingly scary and they are always hungry and will get at you, no matter what. To top it all off if you survive an attack but the creatures have so much as scratched you, you're dead! As the lethal infection from their teeth spreads throughout you. I spent the rest of this fishing holiday pretty afraid.
I now own it in a box-set with 'The Giant Gila Monster' and 'Attack of the Giant Leeches'. It's a great little horror film and worth many, MANY watches. Show it to the kids if you want them to behave!