Noise in Bottom unit of up/down duplex

[Craig Curelop]

Hey everyone,

So I am house hacking the bottom unit of an up/down duplex in Denver. Overall, things have been good, but my biggest problem is that the ceilings are paper thin. I can hear EVERYTHING the upstairs tenants are doing. I won't go into details. 

They have a dog. So I do not want to put carpet in as the floors will be much harder to clean. 

Does anyone know the best (and most economical) way to mitigate this noise WITHOUT putting in a carpet upstairs?