That's what Greyhounds are for.
They love being able to sleep all day, love you for ten minutes, have some food then go back to sleep.
Add a walk in now and then and they're happy as Larry.
Just a warning with them. A friend had one and would have to leave it at home while at work. Destruction ensued.
Very, very intelligent dogs, need a fair bit of training and exercise to temper their potentially bad habits though.
If someones home all day to keep em company they should be fine...
That's a Whippet, clean themselves like a cat.
Given the cats already there if it's a puppy should grow to like the cat, if its an older dog might have issues with cat.