The animal is described as having the shape and size of a leopord, with an ochre coat polka-dotted with blue and white spots. These spots are more concentrated on the beasts back, and is less concentrated on its flanks. It has a long hairy tail, and its head is said to resemble that's of a civet, but with very large teeth more like a leopords or a lions. The creatures trail is said to be like a leopords but bigger, and when it runs, it leaves behind claw prints, not characteristic of a leopord.
Bernard Heuvelmans, in his book Les Derniers Dragons d'Afrique (1978), suggests that the mourou n'gou may be a specialized variety of saber-toothed tiger which has evolved to live in a watery environment. He also looked at the mourou n'gou as a reptile with morphology in accord with the mourou n'gou. For more info, see Mystery Cats of the World(Robert Hale: London, 1989) by Karl Shuker and a new book by the same author, entitled In Search of Prehistoric Survivors(Blandford Press: London, 1995).
(C) Ben S. Roesch, with a big tip of the hat to Strange Magazine and Karl Shuker for the whole backround to this report.