Most pets don't work because their owners don't bother to train them to do any work. And interestingly enough, I have indeed seen a Chihuahua herd cattle. There was No Fear. It was amazing to see that little toothed monster chase a 2000lbs bull around a pen and into another and then into a barn on command from the farmer that owned him. And a Mastiff will gladly hunt fox, cougars, wolves, and even people if you want them to. They will also happily Netflix, popcorn, and chill on the couch with you after chewing up that human also.

Why don't my dogs talk? Well, they just don't have the physical voice box to form the sounds of human speech, (as you well know). But that doesn't mean they don't communicate with people. Actions, like tail wagging, barking in various tones and volumes, rolling on the ground all communicate emotions and situational reports. And us humans understand them just fine. My little Russian Spaniel does her best to "talk" to me with a near continuous stream of moans and groans, and erffs when she sits with me in my recliner. It's almost annoying when she doesn't shut up. And they understand my communications. My dogs understand verbal, whistle, and silent hand signals and respond correctly and instantly to them when I'm afield with them. Parrots, have a natural physical ability to mimic other sounds, (as do a lot of other birds). So they are doing what comes naturally to them - a human is not required.

There are lots of dogs out there that do jobs they were never bred for. Seeing eye dogs, dogs trained for deaf people or assistants to people confined to a wheel chair. Turns out Labrador Retrievers are really great at this kind of work. And I have trained retired Springer Spaniel hunting dogs to work in a hospital as therapy dogs. But that's not why or what those breeds exists for. Ever see a trained animal act at a circus? They are often what most people would call "mutts". Mixed breed dogs doing amusing things like ride bicycles and drive little cars around and jumping through burning hoops of fire. And you can often see little Chihuahuas preforming in those acts. All doing things none of them were bred for.

I like the cats that we have. One, a grey and white is an excellent mouser. But he comes from a very long line of barn cats and has a wild streak in him. The other two, are far more interested in cat toys and sleeping in laps and beds than in any mouse - and that's fine. A warm kitty in the lap purring away is a calming and enjoyable thing to have on a cold winter's day. But I'm under no illusion that cats or most other pets can be trained to do all the things my dogs can do.

Dogs are humans oldest and closest companions and co-workers for a reason.