I liked this one because it was mysterious - and mysteries should be mysterious, don't you think? Lots of pictures billed as mysteries really aren't, especially when they give away the murderer too soon. That doesn't happen with "The Howling Dog", which goes right down to the wire before all is revealed.
Warren William makes his debut in this, the very first Perry Mason movie, He is very good, especially with his authoritative, stentorian voice. Most everyone else is just a supporting cast member, including Mary Astor, who is better than the rest.
Warning: if you watch this movie, pay attention! You will be lost if you get up and go to the fridge, as the plot is intricate and can be a chore to follow. There are two couples involved but they become so intertwined you will need a road map to keep things straight. There a couple of curves and knuckleballs toward the end - information we didn't have while the story was unfolding. Ordinarily, you could yell foul, but the picture is so entertaining and the mystery so confounding that, if you are like me, you'll just go with it.