Using temperature- and field-dependent resistivity rho(T,H) measurements, we investigate the anomalous transport properties of a series of compounds of Ca1-xEuxB6 ( x=0.005 , 0.01, and 0.05). It is found that the electrical transport in Ca1-xEuxB6 ( x=0.005 , 0.01, and 0.05) at high temperatures (T=>100K) is dominated by polaron hopping in an adiabatic regime. Magnetoresistance, defined by ... [Show full abstract] Deltarho/rho0=[rho(H)-rho(0)]/rho(0) , is also found to be positive and follows Kohler's rule for compounds of x=0.005 and 0.01, indicating that the transport property is also dominated by a normal metallic conduction. Comparing the results in this study with the polaron hopping model in a nonadiabatic regime for Ca1-xEuxB6 (x=>0.1) [Jong-Soo Rhyee , Phys. Rev. B 67, 125102 (2003)], we suggest that the hopping mechanism changes gradually from adiabatic to nonadiabatic hopping with increasing Eu concentration.