You need to use the possessive “’s” between two nouns to signal a relationship between them. It is also used to signal the possession, characteristics, physical features as well as qualities and quantitative measurement
For example, when you want to express a fact that there is a dog that belongs to Rose, you would say – “Rose’s dog”. All you need to do is simply adding the “’s” after the proper noun. However, it seems to be more complicated when you want to state that there is a dog that belongs to Chris. Many people would argue between the use of s' or s's. Should it be Chris' or Chris's dog?
There are several rules that you need to know about adding the possessive “’s” correctly. These rules are quite easy to understand and follow. However, there are other things such as whether you should use the form “s's”. It is quite a controversial topic. Take a look at this article below for all of the most important things that you need to know about the possessive “’s”.