House Hack Roomate Issues

[Maria Matthew]

Hello everyone, I would love insight on how to handle this situation. I have a house hack that I've transitioned into renting out 5 bedrooms individually (so we've transitioned out of that property and are not living there)

There are issues with two roommates, and would love insight on how to handle them. I also realize I'm the property owner, and I'm not there to parent them, but I do want to make sure they are happy (within reason) and protect my investment

One roommate has a dog and is accusing the other of "disciplining" the dog possibly hitting it (which I doubt but who knows), and bottom line there's just drama. 

I want to know what the healthy line of mediation is, and basically I want to remind them that they're in leases so they have to be adults. Any advice is appreciated!