Is it noisy?
The quick answer is that SwiftPaws no! It is powered by an electric motor which is not noisy at all.
However the flag attached to the line is moving up to 30mph for Home Original, and 36mph for Home Plus. The flag makes noise as it moves through the pulleys and the line itself might make noise the pup would hear as it moves through the grass.
We have recommendations for introducing your pup to SwiftPaws on our website "Get Started" page. Scroll down about half way to the section entitled:
INTRODUCING YOUR PET TO SWIFTPAWS FOR THE FIRST TIME
This page also contains "how to" videos, and some tips that might be useful as well!