And even if we did serve Tenant B with a notice to Quit - what would the infraction be?  

Tell her she is to pick up after the dog as soon as it hits the ground or you will serve notice to evict. 

I have a rental unit in an area that is served by a private water & sewage company.

Serving southeast Massachusetts, Cape Cod and the islands.

Some people may better serve you in specific areas and some may work best with your specific needs.

If you want to optimize earnings from both RE and your day job, until you're ready to give one of those up, you'd be very well served by hiring competent management. 

@Cullen HardyFor a loan of that size, you would be well served to gather some family members together, promise them all 10% on their money and finance the first few that way. 

I asked her about serving notice and getting one in who would pay on time.

Here are some of the other issues:The market prices are relatively low, which means the "conventional" lenders won't lend since the net loan is very low.Credit unions are happy to lend on investment properties, so long as I "live, work or worship in the counties served".Unfortunately I'm used to "conventional" means of financing, so at this stage I'm asking for help, ideas, and assistance to get my plan going. 

I think it answered a ton of my questions and definitely served as a solid introduction to REI.