As long as you stay at 4 units or below you'll even get very advantageous rates on your financing. 

@Jake Posnerstrongly recommend looking closer to home - OOS investing is more difficult than it's made out to be. andwith rates where they are, there's just about no cash flow right now unless you employ a creative strategy or a combination of creative strategies.if you just buy any old property in any old market, you're not going to cash flow.

Have you looked into sale prices and rental rates?

2) What their tenant retention % is for like properties. 3) Rates, whats it going to cost.

For off market, make sure you have a lawyer check the contact. 

One thing I do is pull up the rate and occupancy chart right off AirBnB and see what the bookings look like.

So if every year I would buy an assumable rate property and live in it for a year then rent it out and repeat this.

Rates: 9% to 13% (Most Deals are 11-12%)Terms: up to 36 Months (Most Deals are 6-12 months)Fees: 2-4 points(%) of loan amount paid at closing (Most Deals are 3 points(%))Minimum Loan Amount: $50,000 (For loans less than $250,000 $2,500 minimum fee)Max Loan: 65%-70% of After Repair Value(ARV)100% Rehab Financing Available (Require 20% of purchase price down payment or cross-collateral)Closing Timeframe: 48 Hours - 3 Weeks (Most Deals are 2 Weeks)NO PRIMARY RESIDENCES, NON-OWNER OCCUPIED ONLY, BUSINESS AND COMMERCIAL USE ONLY.

Second to that I like the privacy fence suggestion - blocking the visual contact of the dogs to people at your property will definitely help some.  

Contact your planning and zoning group in Killeen.