Answer:
A close relative of ketchup that people often spread on their dog.
If a dog were filling out a resume, he might list his mastery of this game under "skills."
I have black skin but I look white, What am I?
Slithery critters with a taste for dirt.
They're actually great swimmers now, but later they will become excellent hoppers.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.