At some point my boyfriend and I will be moving in together. We want the dogs and cats to like each other. I am just not sure how to make that happen? What is the best way to introduce them to each other? I brought my maltese over to his house the other day and as long as I was holding her everyone was fine. But as soon as I put her down the cats tail got all huge and one started hissing. Thank goodness the cats are declawed. So should we just let them warm up to each other when they feel ok with it?