How many movies have Donald Douglas and Ralph Dunn acted in together?

They have worked on 8 movies together! Their first movie together was Mr. Moto in Danger Island (1939) while their highest rated movie together was Murder, My Sweet (1944). They have not worked together since The Truth About Murder (1946). They are most known for their mystery films together.

Role
Paul Marvin
Role
Police Detective Faber (uncredited)
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Police Lt. Randall
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Detective (uncredited)
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Lieutenant-Commander (uncredited)
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Quartermaster (uncredited)
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Jed Thomasson
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Homicide Desk Sergeant
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Hackberry
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Deputy with Charlie (uncredited)
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Gordon (uncredited)
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Dave - Convict Custodian on Train (uncredited)
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Ship's Officer - Fight Referee
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Cop with McGurk