I had a harness for my cats, “Rambette” and “(Kitty) Carlisle”. Both of these cats were highly trained. They understood far more than any dog I have ever known. They would come and leave on command. They would go into rooms if I commanded them too,i.e. Rambette, go into the kitchen", she would go. "Rambette, get off the counter and come over here, yelled from the living room, she would obey.
I took Rambette accross the country and she was leash trained. One day, off the Outer Banks she jumped up about 3 feet into the air and somehow removed the harness, landed, and walked into the car, she had had enough of the sun.
Rambette died 3 years ago at the age of 22 years. I had her since I delivered her from her mom Carlisle. It was one of the saddest days of my life. Carlisle died 2 years ago at the age of 25, I had her since she was 3 weeks old and her mother was killed by a car. I rescued her from under a rock where she was hiding. Carlisle would never leave the house. Even if all the windows and doors were wide open. She liked to sit by a screen and look out but that was it.
The death of Carlisle was a Spiritual experience. Barely able to move because of Kidney failure she got up and walked over to my Dalmatian and licked him, and collapsed. I held her for 24 hours straight as she died and when she passed the sun was shining on her as she was laying on her favorite chair. I held her as she passed and that was that. The Dalmatian ,"Jesse ", died last year at 14 years old of pancreatic failure, Carlisle raised him and they slept together for most of “Jessie’s” life.
So, yes they can be trained to do anything. It all depends on the trainer. Rambette used to climb up my back and sit on my shoulder like a Parrot, she would stay there for really long periods of time.
I have since rescued 1 dog and 2 more cats. We lasted about a week without any animals before we could not stand having a dead house anymore.