English bull terrier

Harf Zimmermann. Hufelandstrasse, Berlin-Est. 1987

I have no idea what breed of dog this is.  Any ideas?

Update:  A hat tip to all the readers who identified this dog as an English bull terrier.  Herewith some interesting items from Wikipedia:

They are known for their large, egg-shaped head, small triangular eyes and their "jaunty gait."... The Bull Terrier's most recognizable feature is its head, described as 'egg shaped' when viewed from the front, almost flat at the top, with a Roman muzzle sloping evenly down to the end of the nose with no stop.

Bull terriers have appeared as characters in many cartoons, books, movies, and advertisements, perhaps most famously as party loving Spuds MacKenzie in Budweiser beer commercials in the late 1980s, and more recently as Bullseye the Target dog...

All puppies should be checked for deafness, which occurs in 20% of pure white dogs and 1.3% of colored dogs and is difficult to notice, especially in a relatively young puppy... Early in the mid-19th century the "Bull and Terrier" breeds were developed to satisfy the needs for vermin control and animal-based blood sports...

Bull Terriers have appeared in many movies, including: A Dog's Life (1918), It's a Dog's Life (1955), Oliver!, Baxter, Patton, Toy Story, Babe: Pig in the City, Next Friday, Friday After Next, Frankenweenie, Trainspotting, Bulletproof, Derailed, "Scotland, PA", The Incredible Journey and Space Buddies.

Photo found at Fotografia, via First Time User.