How does carrying extra weight negatively affect a Pugshire that is classified as brachycephalic?

Answer

It compounds the difficulty of drawing air into the lungs.

For brachycephalic dogs with shortened airways, excess weight makes breathing more laborious, significantly increasing the risk of respiratory distress, especially during activity or overheating.

How does carrying extra weight negatively affect a Pugshire that is classified as brachycephalic?
DogmixweightPugshire