Answer:
I am always hungry, I must always be fed. The finger I lick will soon turn red.
When can someone truthfully tell someone “well done” but think they did a bad job?
What is often returned, but never borrowed/
What begins and has no end? What is the ending of all that begins?
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
People take me on walks and I run and have fun. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?