When writing a sentence starting with a number, do you capitalize the following wrod?

Example:
4 Dogs ran from the house. OR 4 dogs ran from the house.

I know in traditional writing you'd just spell out the number, but what is the 'right' way with these examples?

EDIT: Apparently a lot of you guys can't read. I'll repeat in text then. I KNOW YOU NEED TO SPELL OUT THE NUMBER. I'm only asking about the two examples given. Tell me what I've already stated I know and your comment is deleted.