A simplified version of the s±f model, supplemented by the intersite Cooper pair interaction between conduction electrons with opposite spins, is used to investigate the competition between ferromagnetism and anisotropic superconductivity in a single-domain ferromagnet. The calculations of the temperature dependence of the magnetizations m f (localized 4f electrons), m d (conduction electrons) and the superconducting order parameter show the existence of three critical temperatures: T C (Curie temperature), T S1 and T S2 (lower and upper superconducting transition temperatures). The critical temperatures fulfil the relation T S1 TC TS2 . For T P 0Y T S1 the system is ferromagnetic and normal, for T P T S1 Y T C ferromagnetic and superconducting, for T P T C Y T S2 paramagnetic and superconducting and for T b T S2 paramagnetic and normal. The superconducting order parameter possesses a distinct maximum between T S1 and T S2 and vanishes for T `TS1 and T b T S2 in agreement with the recent experimental results for HoMo 6 S 8 . The calculated temperature dependence of the dc resistivity shows a typical reentrant behaviour, characteristic for such ferromagnetic superconductors as ErRh 4 B 4 and HoMo 6 S 8 . Using a suitable choice of the model parameters we can obtain a reasonable fit of the recent experimental results for HoMo 6 S 8 , concerning the temperature dependence of the superconducting order parameter and dc resistivity.