While I have my preferences, I often change my mount according to the place I travel to (if I stay for a longer time) - I have so many mounts from giveaways, free crown crates, new chapter releases, etc, after all. So I used a wolf during the Greymoor chapter, and a camel while travelling Elsweyr (I don't think I have a Senche-raht, also riding on some random Khajiit's brother or son seems a bit creepy to me).

I'm not much of a lore fan, but from what I read they were more reptilian, & the durzog mounts are actually modified through goblin magic in the womb.
Under mount collections I believe ZOS has them under canines though.
https://en.m.uesp.net/wiki/Lore:Durzog