When we see Alma alone on the Niagara Falls trip there's a subtle panel of her with her hand over her abdomen and she has a sullen look on her face. Now the look could be attributed simply to her disappointment that Blacksad wasn't there for her. But the hand on the abdomen seems to me like a masterfully subtle hint that Alma's carrying Blacksad's baby. I apologize if this is dealt with in the fourth album (I haven't read it yet).