I've found that tenants are actually better behaved when they know the owner lives next to them.  

Timothy, can you get a letter from the townhouse property manager confirming the dog was well behaved during your time there and caused no damage?

Plus, they can get into big trouble with the bar if they behave unethically or file frivolous law suits. 

@Jeff Rabinowitz In the tenancy law where we operate, if a tenant makes a request for repair, they are obligated to allow the landlord or his/her agents (read contractor, PM) access to the property to affect the repair.I had tenants who behaved in a similar manner to yours - though they always allowed our maintenance and trades people access.  

They seem pretty well-behaved, but I'd rather not have 5 dogs in the apartment.What can I do?

And, the animal must behave or you can evict them, and you can charge them for any damage the animal causes.

(almost) Always raise rents to keep up with the market, otherwise your property will be have a property $200 below market rents in a few years with no way of raising them on the current resident.

Then there is the possibility that Rob K. raised; since the tenant was away on vacation he might even have behaved badly there and be locked up in some other area.

This is important.There is a direct correlation between how a tenant will behave in the rental and their FICO score.

Owners sometimes have skewed ideas of how their tenants will behave.