If that dry heaving continues go see the vet:
http://www.petservice.com/ask_the_vet/8-15_qa.html
Cat Dry Heaving
5) Question: My 14-yr male Burmese has a constant problem of “retching”. Hunches down and has
symptoms of dry heaving. Periodically, he will throw up but nothing comes out. I have tried Nutri-cal, Petromalt and Laxatone. Also, have checked for worms but is negative. Other than this, he is very healthy. He does this at least 3 times a day. Thank you. MC., Oshkosh, WI.
ANSWER: Your cat definitely needs to see your veterinarian. Vomiting or “retching” is not normal and can signify many things such as chronic hairball problems, obstruction of the digestive tract (partial or full), parasites such as heartworms, roundworms, giardia, viral or bacterial infections of the trachea, throat or lungs, thyroid disease, and even cancer. Your vet will want to take xrays of the throat and chest (possibly the abdomen) and will run some blood work to check for other diseases such as heartworm infection and feline hyperthyroidism. Good luck and don’t delay! Get your cat in today!