I just want to know if her dog barks a lot.

For example, paying $25 every time they don’t clean after their dog’s poop.

I equate this more to my Maltese yapping like crazy at my Bernese Mountain dog every time he comes within 10 feet of their food. 

Don't use your own money -- start with bird/dogging or wholesaling to get your feet wet. 

If this was me, I would be at the property, getting in touch with local Facebook groups and generating bids to get handymen/local contractors taking up urgent jobs that are preventing units from being rented (even at a lower premium) that are ready to help nurse the deal.

A while back we had a PM who did not inspect a certain property because of the dogs.

We’re not in PA, so you know we have no dog in the hunt.

That said, you never want the tax tail to wag the dog, meaning don't make a bad investment just to justify it with potentially deductible tax losses - rents will increase over time, but so will expenses.

One family has 5 dogs and a cat and wants a 3 month min lease, and the other wants a min 6 month lease.

For example, adding a back deck, garden area and dog washing shed in a few of my properties to ensure I attract the best tenants and they appreciate living in my property (and don’t leave).