The use of biogas as an energy source has numerous applications. However, all of the possible applications require knowledge about the composition and quantity of constituents in the biogas stream. Global energy demand is rapidly increasing. In contrast, fossil fuel reserves are decreasing. Today, one of the major challenges is energy supply for the future. Furthermore, effects of global warming cannot be neglected anymore. Alternative energy sources such as biogas should be developed. The biomass has huge biogas potential. However, arable area in the world is limited. Therefore, substrate which will be used for biogas production should be chosen carefully. The aim of this study was to determined biogas yield using thermally treated goat dung. Also this study examined the total solid depletion rate as the digestion process progress. The maximum biogas volume generated from the experiment was 9.1 litres. There was no production of biogas in day 1 of control, 10 ⁰C, 20 ⁰C and 30 ⁰C pre-treated time. The maximum average temperature of the day recorded was 30 ⁰C. The maximum total solid concentration from the experiment was 15% while the minimum value obtained was 4.2%.