Taking care of puppies

About 3 weeks ago, I took care of puppies for 4 days.
One is my puppy and the other is my grandmother's puppy.
My puppy's name is "Mongshil" and the name of my grandmother's puppy is "Sarang." 
Mongshil is a white Maltese and Sarang is a Yorkshire Terrior.
Mongshil is 6 years old and Sarang is almost 2 years old; Both are female.
Mongshil and Sarang are very different in aspect of character.
Mongshil is very well-behaved.
Sarang doesn't keep still for a minute. She's easily frightened.
They didn't make any trouble things like biting the wires or fighting each other but the war of nerves between the two sides had continued.
Mongshil didn't like when Sarang which went into my room but Mongshil knew that Srarang was my grandmother's dog. So, Mongshil just pretended to scare Sarang.
For example, when Sarang came into my room, Mongshil just stared at her.
And when Sarang went to near of Mongshil, Mongshil just acted like Mongshil was going to attack Sarang but Mongshil never bit Sarang.
I tried to treat them fairly but they acted like children.
On the first day, Sarang seemed on edge because it was the first time that she came to my house and stayed at an unfamiliar place.
So, I held her for awhile.
Then Mongshil turned her back on me and didn't look at me when I called her.
I felt really sorry to Mongshil so, I held Mongshil afterwards.
Sarang soon adapted to this environment and she began to hang around Mongshil.
Whenever Sarang did it, Mongshil growled or scared at her.
And whenever Mongshil did it, Sarang ran away.
They weren't getting along with each other eventually.
I was getting tired of minding them but I had a good time with them.

(Your English is very good!~ 사랑 & 몽실? ㅎㅎ Just remember to never start a new sentence with "because" or "but" and the punctuation is always inside of the quotation mark!! Other than that, you're pretty good at English!!!^^)