Welcome to JustAnswer! I am a licensed veterinarian and would be glad to help!
1) When did this start/
2) Does she have any past medical history?
3) Known heart murmur?
4) Does she tire easily with activity?
Started within the last month. No past medical problems or heart murmur. Doesn't seem to tire easily with activity
Does she pant at rest, even when lying down?
In a cool environment?
Here are some thoughts:
In general, dogs pant primarily to regulate their body temperature (to get rid of heat) - unlike people, they really do not sweat...so panting is their primary way of getting rid of heat.Although that would be the primary, and physiologic reason for this behavior, there may be certain problems that cause this abnormally- Problems with the lungs (pneumonia, fluid, even tumors)- Heart abnormalities (murmur, arrhythmia, or even heart failure)- Pain or anxiety- Endocrine disease (Cushing's Disease) where the body produces to many steroids- Sometimes even diabetic dogs pant more than usual.If you feel your dog is panting at rest, at time that you would not expect, I would recommend seeing your vet.A good examination listening to the heart and lungs is essential. Another test that may be very helpful would be x-rays of the chest looking at the heart and lungs.Many causes, some life threatening, can be easily ruled-out by a good examination and simple x-rays.
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