Today I watched Devil Dog: The Hound of Hell. A made-for-tv movie from 1978.
A satanic cult performs a ritual on a breeding dog, which causes her to give birth to a litter of satanic pups. One of the pups is adopted by a suburban family. Over time the dog's evil influence takes hold on the family members. All except the father, who is the only one who can stop the devil dog.
This was an entertaining flick. It's pretty cheesy sometimes. There are cliches to be found. Like the wise, old, religious latina housekeeper who knows immediately that the dog is evil. There are lots of shots where the dog is supposed to be ominous, but it doesn't really work. He just looks like an ordinary dog. It's especially stupid in the beginning, when they try and make the adorable puppy look threatening.
The dog appears in his true demon form a couple times, and it's really goofy looking.
All in all, it's a good made for tv flick. It has decent production values. In this age of SYFY original movies, you'll wish you could see more made for tv horror movies like this.