When you write hashtags that contain multiple words, make the first letter of each word a capital letter, for example #DogsOfMastodon. This will make the tag readable to blind people.

Blind people use the internet through screen reader apps, which read text out aloud. By putting a capital at the start of each word in a hashtag, you are telling the screen reader how to say the tag correctly.

In the non-techy world this is generally known as "CamelCase".

(Techy people may call it PascalCase)