ive always had cats and when it comes to introducing them i just let them work it out, let me explain that, in my case ive never had aggressive dogs who wanted to hurt the cat , they just wanted a good smell and usually they were content, ive had chasing, and if it gets extreme ill usually voice a stern no over and over until the dog kinda gets the idea, at this point my cat stubby and spanky are finally getting together in the same room. spanky is a lover of all animals and thinks everything wants to play, stubby is used to my last two dogs who could take him or leave him,but spanky has a very high prey drive and loves to chase, but lately the cat is coming right back out he is realizing spanky isnt going to hurt him in fact it is the cat as of lately who is ambusing the dog!! we caught him about a dozen times but spanky being spanky things that a play thing and gets down on his front legs and butt wiggling up in the air and barks at the cat who just now sits and listens to it, they are eating to gether and sitting in the same room together, thats just what i do let them work it out without injury. good luck