Lucca's long lost friend

Tonight Nero (the Whippet) is coming to stay with us for three weeks. Nero's house mate Vegas, is in heat and he cant be anywhere near her. Lucca and Nero grew up together and were the best of friends, but haven't been living together for about 2 years now. Still they almost eat each other up when they see each other. It is going to be very challenging to have three dogs and two cats in the house. I hope Nero is ok with the cats, and I hope we will be ok with three dogs trying to sleep on the bed. What have we agreed to?????