While Jennifer Aniston says hello to another fling with John Mayer, she’s preparing to say goodbye to the most loyal male in her life: her 14-year-old pooch, Norman.

Sources tell OK! that Jen is worried about her ailing, devoted dog.

“Norman is old and hasn’t been doing well,” says Jen’s friend. “She’s terrified her best friend could soon be gone.”

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In fact, Jen’s so concerned about her corgi-terrier mix that she’s sparing no expense to keep him alive. “When Norman started having joint stiffness and had a hard time getting up and walking, Jen hired a personal masseuse for him,” says the friend.

“He’s doing a lot better, but Jen is extremely paranoid about something else going wrong,” explains the insider. “Losing Norman would be a big blow.”

Stay healthy, Norman!

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