thia, this sounds very similiar to my two puppies...
one in particular is very protective of Eden. noone is allowed near me when i am walking with bub and puppies, shes barks them away and when hubby is doing the vacumming Gazzy(the mini foxy) will sit right next to Eden in the bouncy, as if she is standing guard and the vacumm cleaner is the on coming enemy. it is so so sweet. Even when im booby feeding Eden, Gazzy jumps up on the chair and sits in my lap behind Eden... All the time now Eden will pull off lean back and "pat"/thump Gazzy on the head.
its lovely that ur cat is so protective, they must sense ur love and are keeping a close eye on bub as a sign of their dedication to you.
I just worry Eden will go up and give complete strangers dogs pashes, thats what i keep catching her and Gazzy doing!!!!! Ewwwwwwwww