Anyone’s advice would be greatly appreciated...Our 12 year old collie for the last few months has been breathing heavier than normal. It started with a hacking cough. Took him to the vet who thought it maybe a bacterial infection so was treated with antibiotics & lung worm medication for a week. It did seem to improve but has never really got better. He does still cough occasionally but it’s the heavy breathing I am concerned about. Other than this he is a well happy boy, eating, drinking, walking normally...(although a bit slower now as he is an older dog :) ) Any suggestions would really help. Thanks again. Ps. He is on metacam for his joint pain.