The use of handmade particulate reinforced alloy horseshoes (MMC metal matrix composites) was tested in a field study on 15 riding and draught horses. All horseshoes have been tempered after having been manually forged and tested concerning their surface imperfection. Forging temperature ranged between 350 degrees and 420 degrees C. Horseshoes in series A consisted of particulate reinforced wrought alloy (22% Al2O3 in alloy matrix). 11 shoeing periods with a duration of mean = 49.7 days (sd = 13.6) were evaluated. Horseshoes in series B consisted of particulate reinforced foundry alloy (20% SiC in alloy matrix), 5 shoeing periods were evaluated with a duration of mean = 45.4 days (sd = 7.9). Series C tested horseshoes made of particulated reinforced coextruded wrought alloy evaluating 6 shoeing periods with a duration of mean = 49.2 days (sd = 18.7). Service of the tempered particulate reinforced alloy horseshoes was significantly higher compared to untempered alloy horseshoes. Mechanical and forging properties of tempered particulate reinforced alloy are satisfactory. Service is only suitable for riding horses but not for draught horses.