@Corrin Godar, I appreciate your perspective. I also generally agree with it on a gut feeling level - but on paper, the numbers can work. I have not house hacked and probably won't do a traditional house hack any time soon due to our attachment to our current home.
That said, I did want to point out that from people I've interacted with at REI groups, I think there are answers to a lot of your issues - even in Colorado Springs.
1% Rule: Colorado Springs usually does not meet the 1% rule, but the 1% rule is not a very good rule for estimating cash flow. If you need to replace appliances, for instance, they are roughly the same cost whether you put it into a 400k SFH in Denver or a 65k SFH house in Pueblo -- or even 200k house in pueblo just down the street, for that matter. When it comes to percents, Wood, Nails, and Shingles don't care what you bought the house for or what it rents for. (Property managers do though)
I've been running numbers in the Springs a lot this year. Most MLS properties do not cash flow if you're not living there, by my math... but a handful have. You're right that they don't come up often, but a good realtor will help you with that. I'd happily put you in touch with one that's brought me cash flowing deals this year, if you're interested.
Safety: I think other responses have way more experience here and had good suggestions. Although, I have to add that I've heard that if you're really concerned, it's a good idea just to put any new tenants (especially if it's a rent-by-the-room deal) on a month-to-month lease to start (say 3 months) so that you can move on quickly if you need to.
3. Pets: Not legal advice... but AFAIK, you CAN discriminate on people's comfort with dogs. It's not a protected class, unless there's a disability of some sort that affects the dog issue. Any of the realtor's I'd use these days are investors themselves as well as either property manager or part of a brokerage that has property management... so you can actually plan your investment out with them and use their experience to help make it successful.
Plex argument: Very few plexes come on the market, but a few have and cash flowed renting out the entire place. You will need to be ready to move as soon as it hits the market though, for sure.