I have a similar case. Wealthy tenant pays huge rent like clockwork and doesn't bother me (though she is utterly non-communicative and clearly does not like me or my property manager and avoids all contact with us).
But there are other dimensions that [seem to] compel me to take a proactive approach. There are potential liability issues around the dog [I think]. And the neighbor appears to be objectively correct about the noise issues.
I was about to pull the trigger on the letter below and would appreciate your collective thoughts....
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Heather:
Doberman
I have now been informed that the barking Doberman you indicated had been removed has remained at the house in violation of the lease. Please remove the dog from the house right away. Your neighbor, Paul Smith, has been repeatedly awakened by this dog’s barking in the early morning hours (roughly around 2 am). He alerts me that he is prepared to contact Animal Control. This breed of dog creates an unacceptable liability in any case and cannot remain in the house under any circumstances. I try to accommodate my tenants as best I can but I have had liability concerns with large-breed dogs as a landlord and the barking is only one dimension of the problem.
Loud gatherings
As a general matter, I would also request that house guests attending outdoor gatherings at the home please refrain from making undue noise at late hours. It is a wonderful home for parties but these events should quiet down by 10 p.m. I have received numerous recordings from Paul documenting the noise from the parties (and from the barking dog) and the situation is intolerable for him. He mentioned that he is now literally sleeping in his kitchen to ensure he gets some rest. Paul has sought you out to discuss this but has not managed to contact you. In the interest of good neighborly relations may I please recommend you communicate with him and reach an understanding: [Paul's email].
There is a school of thought that suggests that I not intervene in such cases but I feel I owe a duty to other residents and would prefer to head off any escalation if I can do so.
Additional resident(s)
Additionally, if there are other residents at the house this is also in violation of our lease. This is not an issue in principle but I would ask that your agent prepare a suitable amendment so we may bring any such persons under the lease.
I regret the nature of this communication and value your tenancy enormously. I can assure you that I would not reach out to you in this way if these were not serious issues. Please acknowledge your understanding and confirm that you will comply with the terms of the lease. Thank you for your immediate attention to these matters. (Copying our respective agents as I did not receive a response after my last efforts to reach out to you.)
Sincerely,
Landlord