Such hard work can make people “dog-tired.” And, the situation would be even worse if they became “sick as a dog.”
Still, people say “every dog has its day.” This means that every person enjoys a successful period during his or her life.
To be successful, people often have to learn new skills. Yet, some people say that “you can never teach an old dog new tricks.”
They believe that older people do not like to learn new things and will not change the way they do things.
Some people are compared to dogs in bad ways. People who are unkind or uncaring can be described as “meaner than a junkyard dog.”
Junkyard dogs live in places where people throw away things they do not want.
Mean dogs are often used to guard this property. They bark or attack people who try to enter the property.
However, sometimes a person appears to be mean and threatening but is really not so bad. We say “his bark is worse than his bite.”