I have a 6yr old dog (scrappy) a kitten (tuxeda) and a cat (amber) and I just got a new 3 month old shepherd mix (kaden). Scrappy gets along fine with Kaden but my cats won't come downstairs how can I get them used to the new addition to the family? Its only been 2 days so maybe they just need time but if you have any suggestions please give them thank you.