They can. I have my sun cat, and endli with a hoplias curupira. My curu leaves all bichirs alone for whatever reason, but with the sun cat he throws his weight around for sure and bully's him. But doesn't pester the cat. Wolves can have varying temperaments so you have to see how your specific wolf acts. I'd say do it now while the cat is larger. As far as the endli goes, make sure it isn't edible, some wolves have been known to snack on bichirs of the same size.