Westy Lung Disease

Today Scamps has been much more active than he has been for the past week or so. We take him for the same short walk every day, as he cant manage his full walk around the park anymore.
This is the walk we do

Today he had 3 of those walks (10am, 4pm, and about 9pm) usually, we get half way up Mowbray close, and he needs to turn around and come back (even be carried home). Don't get me wrong, he doesn't exactly sprint around, but he just plods on taking his time and every now and then, sits down for a rest for about 3 or 4 Min's, then gets back up and wanders on again.

He still refuses to go for a walk by choice, which until 3 weeks ago, if you even looked at your shoes or heavens forbid, you knocked his lead, you he would be waiting at the door to go out spinning around in circles.

From about 2.5 weeks ago, until about one week ago, he would go up Mowbray close, into St Bede's and back down Park place then The Oaks and home. If we did that walk before 3 weeks ago, he would refuse to back in to the house and just sit at the end of the drive, refusing to move until we walked a bit further even another lap.