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Hi there and thanks for your question.
Most dogs, chihuahuas included should be able to live just fine at 60 degrees. However, the dog should be able to indicate to you whether he or she is too cold. If you notice shivering or seeking heat (i.e. the heating vents, blankets, etc.) then you may want to either turn up the heat or get a jacket for him or her.
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The above is given for information only. Although I am a licensed veterinarian, I cannot legally prescribe medicines or diagnose your pet's condition without performing a physical exam. If you have concerns about your pet I would highly advise contacting your regular veterinarian.