I just have a question and didn't know where else to ask. I have a wolf I have already used a dye on already but I'd like to add some markings to him. When i import him it automatically sets him at a price of 29 apples without me changing anything. If I was to add markings would I have to pay that amount plus the price of added markings or just the price of added markings? I'm a bit confused by it XD

You would need to add the markings first before you apply the dye. What you see in the Custom Maker is what you get.