MikeAqua:

 

I think a mistake many people make is getting one dog.  Two dogs will entertain each other.  You won't get boredom-barking or anxiety-howling.  You will still get territorial barking, but that can be managed with fencing, planting and training.  But yeah, dogs can smell.  Cats do too.  I can smell a house has cats the minute I walk in.  

 

With cats it is usually the litterbox. If you actually smell a cats fur there should usually be no smell at all. But maybe some do due to diet etc