The present invention relates to particular cationic tetrahydropyrazolopyridine compounds of formula (I) below and also to the use thereof for dyeing keratin fibres in particular human keratin fibres such as the hair. The invention also relates to a dye composition comprising in a suitable dyeing medium one or more cationic tetrahydropyrazolopyridines as defined previously. Finally the invention relates to a dyeing device using the said composition.
