How does Squeaky protect Raymond in "Raymond's Run"?

From the very beginning of the story, it is obvious that
Squeaky not only "minds" her brother Raymond, she is his protector. Whenever she is
training or practicing her breathing exercises, she is always sure to keep Raymond on
the inside of the sidewalk, never close to the street. This way, he won't run into the
street or splash in puddles, getting himself wet and dirty. Squeaky has no problem
standing up for her brother. When Gretchen and her crew of flunkies try to start trouble
with Raymond, Squeaky is quick to tell them; "You got anything to say to my brother you
say it to me..."