I have 3 dogs and 4 cats. It was NEVER easy when we first put a cat with our dogs or another cat with our cats. It took a good 3 weeks for them to adjust to each other and get along.

But they are all the best of buddies now and don't mind each other at all! It takes some time and patience! But, they will get over it!

We actually kept our new addition seperated from the rest of the animals for a few days and let them see each other a bit at a time. It really helped.