Dear {Name},
I know there is nothing I can say to make it better, and nothing can bring back your beloved {Pet Name}. Still, I want to apologize again. You trusted me with your pet's care and I let you down.
I never imagined that {situation that led to pet's disappearance or demise}.
There's no way to replace a member of the family, which is what {Pet Name} was to you, so I won't even try. Please just know how truly, deeply sorry I am.
Sincerely,
{Name}
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