Yes they will, especially if the dog is much smaller that themselves. Mountain Lions have a high prey drive, they have to in order to survive and anything smaller or weaker is prey.
mountain lions, bears
Coyotes , wolves , dogs , mountain lions ,
Mountain Lions....big dogs
Mountain lions are big cats with usually tan fur, and they eat meat, preferrably deer. Cougars sometimes called Mountain Lions like to eat deer, sheep, domestic cattle, horses, , particularly in the northern part of its range, but it eats things as small as insects and rodents
Mostly wolves, cats, coyotes, they dislike dogs, and mountain lions.
People, large dogs, wolves, mountain lions.
I doubt it, remember that mountain lions are feline and dogs are canine. Let me put it this way; it is very hard and uncommon for a zebra and a horse to give birth together, so it is more unlikely that a mountain lion and a dog could do so.
Big cats (such as leopards, mountain lions, etc) and crocodiles are known to eat dogs.
Mountain lions and wild dogs will eat llamas. Humans will also eat llamas.
Mommy and Daddy Mountain Lions.
Of course, mountain lions live.
There are no mountain lions that are in Pennsylvania.