You won't be able to fully enjoy Little Sheep if you are not accompanied with hot pot experts. There are so many ways to appreciate the food and so many combinations are possible. You indeed have a wide choice of vegetable, noodles, fish or meat balls available but the fountain drinks are way too sweet tho. You should ask for both a spicy and a regular broth but make sure you get lamb - yeah that's you are here for.
Some pieces of meat might be frozen but nothing made me question the hygiene of this place. It was clean but I agree that we may doubt of some the places in this area in general. Friendly service on top of it who might even extend its hours just for a party of two.
However, main con: the AC was UNBEARABLE.