Dumas was sentenced Tuesday by Judge Sam Myers of Maricopa County Superior Court under a plea agreement with prosecutors.
Dumas, 45, pleaded guilty Dec. 11 to two felony counts of theft stemming from offenses on two dates in September 2012.
Authorities say Dumas stole about $800 worth of merchandise from a Luke Air Force Base store while working with a janitorial service. They say Dumas was seen on surveillance cameras taking cigarettes, alcohol, food, DVDs and shoes.
Dumas played for the Suns from 1992 to 1995 and helped Phoenix reach the NBA Finals in 1993. He was waived after missing a drug test.