[ MacAlister / Aisling Grey series ]
I've not read any of these, so apologies to MacAlister fans if I get any of this wrong. From what I gather, this series, from prolific British author MacAlister, is a paranormal-romance- mystery-thriller-fantasy series... or something like that. One of the main characters is Jim, a relatively nice demon, I'm told, who takes the form of a Newfoundland dog. He also apparently appears in other works by MacAlister that are not part of the Aisling Grey series — Love in the Time of Dragons (2011) being one such work.
For adult readers only, it seems.
You're probably best off checking MacAlister's website on this one :)