Last week I adopted a mixed breed dog from our local animal shelter. She is a sweetheart but very energetic. Since we have acreage, the dog lives outside and she loves it. The dog was cat tested before leaving the shelter and she showed no interest in the cat there. I bring home, Delilah the dog, and introduce her to my indoor cat. The cat remained calm so Delilah showed no interest. Then, the outdoor cat comes in to eat and she is terrified of Delilah, starts to run and the Delilah goes wild chasing her. She appears to be getting more aggressive in her determination to catch the cat. I am resorting to tieing up the dog so the cat can eat in peace.
Any suggestions on how I can deal with this? Here we have a farm so the dog can be free and I don't want to have to tie her up all the time yet I feel so sorry for my cat. This is a cat that hates the indoors so that is not a solution. Can the hunting instinct be trained out of a dog?
Put the cat's food somewhere out of Delilah's reach. Unless you live outside too, the dog will have plenty of opportunities to harass the cat without your input, so the behavior is being practiced. Practiced behavior such as this will escalate, so bear in mind that you very well may one day come home to a dead cat. Outside dogs tend to make their own fun, and cat chasing is fun. For some dogs the fun is in the killing too.
We have four of our own cats and several ferals. You have to teach the dogs with each cat individually - basically "this cat is a family member, so don't kill it."
Safest way is to put the cat in a cage and bring it inside and let the dog sniff and reward for calmness (or aversion training, but IME that's not as successful long term). That is a *very* watered down version of a rather involved process. The cat also has to learn about the dogs.
Our current four will kill a non family member cat in a heartbeat, and have. But our own cats are safe with them. The dogs pounce on them and even mouth them, but without injury. Plus the cats are smart about the dogs.
Just a comment. We live on 20 acres, surrounded on 3 sides by 500 acres of unused timber company land. Our dogs could easily be outside dogs, but they're not. Yes, they spend a LOT of time outside (as do the humans), but at night they come in with us, they eat inside, they sleep inside, and they participate in being with the family inside. If you're wanting to train this dog to do anything, it will be MUCH easier for you if you at least bring the dog in at night. This is an adopted dog (so no puppy bonding with you I presume), who has no reason to "connect" with you other than you bring her food from time to time. If she's outside, she can find a lot of her own food. IOW, you're fairly meaningless to her - unless you make yourself meaningful - which will involve making your house (full of your smells and your presence) her home.