heart and kidney disease

I own two male shelties that are from the same litter. They were diagnosed with heart and kidney disease. They both take 1/2 tablet of vetmedin once a day along with 1/2 tablet of enalipril once a day and lasix twice a day. They both still suffer with some coughing and hacking throughout the day. Ocassionally they are vomiting. My question is there anything else I can do to help them so that they are not coughing or vomiting. They are almost 12 yrs. old and I have had them since they were six months old I don't want them to suffer with this coughing. Has anyone else had these problems with shelties or any other breed thank you for your help

[lindapalm]

I had a sheltie, but didn't have your problem.  Ours had Cushings disease.  If you scroll down and click on Animal Health General on the right side of this page, possibly the vets there could give you an answer.  Good Luck