COPD

I was diagnosed with COPD 5 years ago, I have no medication except an inhaler that gets changed every year and I have never had to use it, I am retired now and given up smoking for 15 years after smoking 40 per day when I was driving. I go for my "blow in the machine " every year and it has not got any worse or better over the last 5 years but if I rush for the first hour after getting up I gasp for air. I was advised by the Doctor to take exercise so we took on a rescue Jack Russell and walk about 3 miles a day which gets my lungs really working which they say is good. I feel well but have had to start taking blood pressure tablets since last week.