The results of dowel tests to investigate the behavior of carbon fiber reinforced polymer (CFRP) tendons subjected to tensile and shear forces are presented with particular attention to the relationship between the ultimate dowel shear force and tensile force. The effects of several parameters, such as type of reinforcement, concrete strength, presence of stirrups, and use of fibers are discussed. Under combined tensile and dowel shear forces, reduced ultimate dowel strengths and shear displacements were generally observed. The ultimate dowel shear force of the CFRP tendons tested decreased elliptically as the tension ratio increased, while the corresponding ultimate shear displacement decreased linearly with an increase in tension ratio. The effect of adding steel fibers or stirrups was similar to that of having a higher strength concrete.