If you lie down with dogs, you will get up with fleas
You will acquire the faults of bad people if you associate with them.
Steven’s father warned Steven to stay away from the older group of rough- looking teenagers by saying, “If you lie down with dogs, you will get up with fleas.”
in the doghouse 招災惹禍（在狗屋裡）
in trouble. 惹上麻煩。
Tom was in the doghouse with his wife after drinking with his friends and returning home at 3:oo am.
It’s a dog eat dog world 這是個同類相殘（狗咬狗）的世界
It’s a vicious cruel world. 這是個凶險殘酷的世界。
Before leaving home, Darren’s father told him, “It’s a dog eat dog world, so be careful.”
Love me, love my dog 愛屋及烏（愛我，也愛要我的狗狗）
If you love someone, you should accept everything about that person, including their faults.
When Joe asked Karen to marry him, she responded by saying, “Love me, love my dog.”
You can’t teach an old dog new tricks 積習難改（老狗學不了新把戲）
It is very difficult to teach new skills or change longstanding habits or character traits in people. 要教會人們新技巧，或令他們改變積習或人格特質是非常困難的。
I tried to show my father how to use the computer, but you can’t teach an old dog new tricks.