My cat has difficulty breathing

My cat is about 10 years old and overweight. She has been experiencing some difficulty with her breathing. Sometimes she starts coughing and it almost sounds like i can her fluid there..like pneumonia or something. She does this a couple times a day and i'm concerned. It also looks like she has extra weight under her neck and i wonder if something is choking her..could it be allergies? Any help would be appreciated..i will be taking her back soon for another check-up but was hoping for some answers here as well. Thanks

[Aleda M Cheng, D.V.M., C.V.A]

Your cat could have feline asthma, allergies, an upper respiratory infection (sinusitis, bronchitis or pneumonia), increased respiratory effort due to obesity (Pickwickian Syndrome), heart disease, or diabetes. and more.

Increased abdominal or thoracic fat can cause a patient to retain internal heat causing the patient to drink more cold water and pant with an increased respiratory effort.

Please bring her to the vet as soon as you can so that your vet can check her for the above mentioned diseases.  And please place her on a NO Grain, very low carb diet.