What can I do about Pet Noise?

[Steve Garner]

I have received a few called from a tenants neighbors saying that her dog barks all night long.  My lease states that if an animal is deemed dangerous that they have to remove him within 48 hours.  However, in this case the neighbors have contacted animal control several times and they either haven't or cant do anything about it.  What can I legally do to help the neighbors?  Is this any kind of breach of the lease?  (It is a desirable property and I could easily rent it to someone else.)  Thanks for your input!!!!