Gray or Grey
If you are here because you concerned about a spelling error then you will be glad to know you are correct on this one. It doesn't matter which spelling you use. They both have the same meaning and both "gray" and "grey" are correct.
For example, these sentences are both correct. The grey cat is bothering me. The gray cat is bothering me. The same is true for non-color uses of the words such as a grey day or gray mood. You can see that the Merriam-Webster definitions for grey and gray each have the same meaning.
The "grey" spelling of the word is considered to be the British spelling and original English spelling of the word. The "gray" spelling is the American version. We decided to change in America for some reason.
When it comes to an official name of an animal species, a person's name or a place you have to use the correct spelling. This has caused confusion and problems in some cases. For example, a Canadian bird - the gray jay - uses the American way of spelling the color gray. The Star notes that some Canadians would prefer it to be the grey jay or better yet, the Canada jay. A few other animals with the color in their names are the grey heron, gray wolf and the African grey parrot.