Australian Cattle Dogs (aka ACD, blue heeler, red heeler, Queensland heeler, ect) are mostly a driving breed. They tend to work off the back end of the animal. Good ones will also work the head if necessary, to get one that turns on them moving. A really good one will work out from the handler and read the handler's body language for cues. Hearing is not a strong suit for ACD's, so when training, I always recommend the audible command be followed by a visual one. I also train mine not to give up, thought they must have this in them naturally to an extent. Mine know if an animal tries to quit the herd, they will move them main herd, then go back and run the quitter in circles until they are tired enough to just go where the dog tells them to. I also expect a good ACD to be able to run sweep on a large herd, continuously moving back and forth between handlers/riders to keep any stragglers moving up into the main herd. Again, they should have a natural instinct for this, just trained to enhance it. I like the ACD for many reasons, one of those being that they can get angry and don't give up. Sometimes they need to remind the stock who is boss!
Texas heeler is a slang typically used for a ACD crossed with an Aussie, though it is also used for about any ACD mutt.
Mixing dogs with different working methods will probably not achieve successful results. I would expect you to spend more time communicating with the dogs then actually getting anything done. And I'm fairly certain whatever stock you are working would become equally as confused! Mixing breeds in a working pack is not an issue, but mixing working styles probably would be.
