Found throughout the dry regions of Africa, the Sahel goat represents about 80% of Niger's goats. In accordance with national breeding policy in Niger and with a view to better planning management of that genetic resource at local and national levels, its phenotypic characterization has been conducted in the northwestern part of the country from July 2011 to May 2012. Based on the voluntary participation of farmers, investigations to characterize the quantitative parameters (height at withers and rump, body length, chest girth, chest depth, hip width and length of horns and ears) focused on 443 goats (77% female, 39% adult) distributed in 145 farms and 60 sites (7,38 ± 6,87 animals/site) in the Tillabéri, Tahoua and Niamey regions. Biometric indexes analysis coupled with analysis of variance and multivariate analysis (ACP, AFD) showed that the study area goat has four morphological subtypes (Tillabéri, Tahoua, Niamey and an intermediate Niamey-Tillabéri). Due to the coexistence of several breeds (local and exotic) in Niamey and consequences like genetic mixing, the Sahel goat can correspond to two subtypes: a large one (64.98 ± 6.77 and 68.27 ± 5.91 cm at withers and rump respectively), long ears and horns (20.3 ± 3.08 and 14.75 ± 4.43 cm) in Tillabéri and another large one (60.71 ± 10.81 and 62.46 ± 10.65 cm at wither and rump), shorter ears and horns (12.32 ± 3.62 and 9.95 ± 4.01 cm) in Tahoua.