I’ll give you three hints :
1.this kinda animal is lovely
2 this kinda animal is obedient
3 this kinda animal likes eating bones
part1:words and expressions
dog:
n:卑鄙的人
v:跟随.
part 2:various dogs
1、牧羊犬 sheep dog /herding dog
2、工作犬 working dog:
guide dogs 导盲犬
police dogs警犬
sniffer dogs 搜救犬
3、狩猎犬 Hound dogs/ hounds
4、Toy dogs 玩赏犬
5、Tibetan Mastiff 藏獒
part 3:slang about dogs
rain cats and dogs .
eg:It was raining cats and dogs yesterday.
2.dog days 三伏天
eg:I dont like dog days in summer.
3.a top dog
A: 领导者 B:大老板(top banana)
eg:He is a top dog in the school.
4、be old dog at sth
eg:He is an old dog at computer repairing.
5、Every dog has its day
eg:C'mon ,every dog has its day,believe in yourself.
6.dog -tired.
eg:I was dog-tired after the basketball game.