Crudest way is make multiple pages with simple graphics and links that are yes/no that point to other pages.
If it’s only 3 questions make a product with the questions as variant titles.
Otherwise either build it custom, or use a questionnaire form service/app.
If you need this type of customization built then contact me by email , or see contact info in forum signature.
ALWAYS please provide context, examples: store url, theme name, post url(s) , or any further detail in ALL correspondence.
In Shopify, create a product for the item you want to offer size recommendations for, such as dog clothes or accessories. Then create variants for each available size. For example, if you offer sizes Small, Medium, and Large, create variants for those sizes. Next, I recommend implementing a pop-up size chart table or dropdown with an accompanying image displaying a dog size breed chart.