Both shootings were recorded two years ago on cellphone videos on which Matthew Tyler and Deshun Hampton, both 18, are shown talking, laughing and firing guns.
They each face more than 75 years in prison when they are sentenced next month by Criminal Court Judge James Beasley Jr.
Tyler pleaded guilty earlier this month to an aggravated robbery charge and was sentenced to 11 years in prison.
Both men are in jail without bond.
Tyler and Hampton pleaded guilty to multiple charges that include aggravated robbery, aggravated burglary, aggravated assault and employment of a firearm.
The incidents occurred between June of 2012 and January of 2013 in the area of Kimball and Cherry Road in southeast Memphis. At least eight people were victimized.
On May 24, 2012, at around 4 a.m., a security guard sitting in his vehicle in the Cherry Crest Apartments he heard multiple gunshots and was slightly injured by flying glass that cut his face.
A cellphone video showed Hampton and Tyler smiling and laughing while firing at the guard’s vehicle from a short distance away. They pleaded guilty to attempted first-degree murder.
On the same video and same date, the two comment about silencing a barking dog behind a fence as Hampton shoots the pit bull in the neck. The dog cries in pain while the two men run away laughing.
The dog was one of three used for security by a businessman in the 1500 block of Cherry Road. The animal died two days later.
Tyler and Hampton both pleaded guilty to animal cruelty and intentional killing of an animal. An unknown third party made the video recordings.
A third defendant, Devonta Hampton, is charged with nine felony counts from the crime spree. His cases are still pending.
The cases were handled by DA administrative assistant Tom Henderson and by assistant district attorney Jose Leon.