I feel that is saying "it's okay to just put your dog out in the yard to entertain itself"...and that is exactly what lots of people with fenced yards do.Then the dog develops bad behaviors such as barking, digging, lunging at people/animals passing the fence, jumping the fence and getting into trouble.

It gets a bit awkward because it is normally due to one tenant's behavior and the other doesn't want to be penalized, but it works out.

Try to have the mindset of a hotel manager at a luxury hotel or a top airline; very friendly and polite, but the rules are the rules.We have to re-trail our new tenants often, because they come with some "bad behaviors" from a previous bad landlord.

Crazily his behavior harms his own interests: if he interferes with my ability to re-rent then he is on the hook for rent himself.

I have half a mind to send the douche bag a note telling him the house is not available to him on account of the rude behavior during the tour. 

Dogs that get complaints for aggressive behavior can be removed. 

I can understand his concern over a significant rent increase, especially unexpectedly, but it doesn't justify rude or aggressive behavior. 

If you want them out no matter what, then don't renew the lease.If you're ok with them continuing their behavior (because they will), then increase the rent.

Money is 80% behavior and 20% head knowledge.

I got so enraged over their behavior (long story) that I ended up putting up a web page devoted to all the crap we had to deal with from them.