Allow current tenant to buy a dog - lease agreement prohibits

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I have a SFR in Austin, TX leased to a woman who is 60 years old and disabled. Her father is financially responsible for the lease. He called yesterday, mentioned 2 break-ins on the same street and said both houses had alarm systems. My SFR has an alarm system, but not activated. Given the break-ins, he requested a dog for his daughter, but our current lease prohibits pets. That was my preference to protect the SFR.

Would like your thoughts on how to approach this... More context, current agreement is 24 months and we are 8 months in. No issues with current tenant.

Thanks.