Three men forced their way into a home in Leyton and punched and hit two women before stealing a bulldog puppy, a laptop computer and two mobile phones.
The men knocked on the door of the home at 12.30am claiming to be police.
When a 40-year-old woman who lives at the address opened the door she was slapped around the head and face and hit with an axe handle. A second women was punched in the face.
The gang took a four month old tan coloured American bulldog worth £2000.