Corrected sentence (two good versions):
1) Fennec foxes and jerboas have furry soles, so their feet don’t burn on the scorching sand.
2) Fennec foxes and jerboas have furry soles so their paws don’t burn on the hot sand.
Short explanation for a 6-year-old:
- Your sentence is easy to understand — it says these animals have furry bottoms of their feet to keep them safe from hot sand.
- You can add a comma before "so" when you join two full ideas. Version 1 is a little more formal with the comma.
- "Don’t" is a short way to say "do not."
- "Scorching" means very, very hot. That word is fine, but "hot" is easier to read.
Both versions are correct. Great sentence!