My dog gets along with other dogs, but my grandmothers chi was a female and hated all other females. I hear that chi's are "clannish" and tend to prefer other chi's, but I really think it depends on the dog and whether or not they had positive experiences with other animals in their life.
However, be patient. Sometimes it just takes time, they should be able to work it out and may even become friends. Being involved in rescue, I have seen WAY too many people give up far too soon on their pets getting along. Even if they never adore each other, they will find a way to peacefully coexist.