Can I make tenants get rid of dog?

[Wendy M.]

I have a family that moved in saying they had 2 miniature pinschers. One possibly is but the other one is clearly some kind of pit bull mix. Multiple neighbors have called animal control on them because he gets loose or is on a ridiculously short chain attached to a tree. Property managers sent tenants a letter but they are denying that it is a pit bull, "it is not a pit bull, it is a mixed breed". They are refusing to do anything about it. If someone has a pit bull mix are they allowed when pit bulls are not (insurance has given me a list of 6 breed, I think, that are not allowed and pit bull is one of them)?  What would you do? In NC.