bad time to evict a tenant due to holiday season?

[Edita D.]

Hey guys,
we have a tenant does not clean up after her pet, or leaves plastic bags full of dog waste on the property corner, and claims that it's the "neighbor's dog relieving itself and not hers". Since we do not have a fence, we do not have proof (however, other tenants saw her doing it).
We wanted to evict this tenant, but would you recommend waiting until Feb 2013 due to the holiday season approaching? I read an article here on BP that this is not a good season to find renters.
My concern is that another unit just came up at that property, and it may be difficult to rent if there's dog waste on the lawn here and there (she picks up the waste every 1-2 days). Please, keep in mind the property is located in mid-to-low-income neighborhood.
Evict or wait?
Thank you!

P.S. The tenant is otherwise very clean and pays on time.