I NEED ADVICE😭😭

I NEED ADVICE😭😭

My best friend and her boyfriend just moved back from Out of town and they need to stay with me. But she has a big dog mix. He is not well behaved and I already have 4 dogs! 

One of them is new, and I still have to keep an eye on the them all. 

I just can not take on a 5th dog. 

Plus my SO will not be okay with a 5th dog, it might really cause problems.

How do I tell my best friend she can come but her dog can't 😩😩😩