Which of the following sentences is punctuated correctly?

a

The puppy chased it's tail, I thought it was so funny!
b

The puppy chased it's tail; I thought it was so funny!
c

The puppy chased its tail, I thought it was so funny!
d

The puppy chased its tail; I thought it was so funny!

The correct answer is c:

"The puppy chased its tail, I thought it was so funny!"

The correct sentence is option c: "The puppy chased its tail, I thought it was so funny!"