How long does a chihuahua normally stay in heat ?

How long do they normally bleed for? I need to know what to look for.

My Chihuahua normally stays in heat for 3 to 4 weeks. Though it's never really bad or heavy becuase she is only five pounds....I still put a small diaper on her which is very annoying to her. She has a tendency to wet the diaper constantly.

The female dog stays in heat for 10 days but the order stays another 5, hope this help ya,,