Other PMs on here toss of lines like, "He smelled like cat pee; application denied."

If they insist on payment without evidence, you can always hire another plumber to look at the site and confirm or deny what was done.

You did him a favor by allowing his dog and this is how he repays you.You are in for 10 months of abuse.

I tried to copy and paste but it denied me access.

There is no doubt she will get much more abusive and aggressive before she gets better. 

A Business policy is underwritten to be a Homeowners policy and you could be giving them an opportunity to deny future claims because of this. 

Some rentals look like they make crazy money on paper, but they lose a ton in reality due to high evictions, high crime, heavy abuse, broken leases, theft, and more.

Located in Index,Wa was previously denied a DSCR as it was considered more ‘rural’

Is there something that would allow him to deny us access?

If you think you are gonna find someone who is highly skilled to beg you for your business when you act like that, you are mistaken.Perhaps you have enough knowledge that you can just abuse a newbie agent who's got no other way to make a commission.