Here is the Presa Canario:
It has been bred for a long time as a cattle dog and guard dog, and also for it's ability to fight. They aren't really tall, but they can be mean and fierce.
The Presa should be powerful, balanced, and imposing in appearance. It is heavily built, but able to move with great athleticism.
The head is broad, massive, square, and powerful. Proper head and good expression are part of the breed standard, and are manifest in the best breed specimens.Males average between 23.5-25.5 inches at the withers and weigh between 110-130 pounds.
They of course can be bigger than this.
Here is the Gray, or Timber, Wolf
It is adapted and evolved for endurance, especially in travel. It is generally a team-work fighter and maybe not very effective when solitary.
Wolf weight and size can vary greatly worldwide, tending to increase proportionally with latitude as predicted by Bergmann's Rule. In general, height varies from 0.6 to .95meters (26?38 inches) at the shoulder and weight ranges from 20 to 62 kilograms, which together make the gray wolf the largest of all wild canids. Although rarely encountered, extreme specimens of more than 77 kg (170 lb) have been recorded in Alaska and Canada. The heaviest wild wolf on record, killed in Alaska in 1939, was 80 kg (175 lb)
View Poll Results: Which would generally win in a one-on-one fight between a Presa Canario and a Wolf