Quest For Glory(not really D&D, but old) had them as a Grey, Pot-bellied, lanky, human-heightish, short-eared magical Goblinoid(holy shit: Endermen?). I never encountered any refference to them in western literature with either dog features or lizard tails or scales until some of the more recent Forgotten Realms books; Their presence always seemed like an after-thought. I mostly read the D&D novels though.
Never occoured to me that any dog-people I saw in anime or manga were kobolds, nor that those came into Japanese media through D&D, but un-like D&D, a lot of them were named characters that did stuff.
Still haven’t seen a depiction of a lizard-Kobold. Sounds more like a Dragon-born’spet.