I have a question about clicker training an animal. Does it get confusing if you try to use clickers for more than one pet?

My dog is clicker trained, but I wanted to start on my horse. I'm worried that my dog hearing the clicks, and not getting treats (because the horse is getting them) might frustrate him, or even train him to the wrong thing because he thinks he's doing something right, when in fact it's the horse doing something right.

Is there a good way to have multiple animals clicker trained in the same household?
Can you get clickers that make different sounding clicks, and use a different one on each animal? If I get a second dog and second horse (SO wants one of each of his own), then I'm starting to get up towards
4 clickers, so I don't know if that's even a viable solution...

Is this even a problem, or do they figure out that you're working with the other animal?
Isolation isn't always a solution, because part of the clicker training is teaching interaction with eachother.
Thanks for any advice.
I have a question about clicker training an animal. Does it get confusing if you try to use clickers for more than one pet?

Depends. In a classroom full of clicker students, somehow each dog hears only his own. But in a household where all the dogs are focused on and waiting for the same owner to click them, 'tis a problem.
Is there a good way to have multiple animals clicker trained in the same household? Can you get clickers that make different sounding clicks, and use a different one on each animal?

Soon!!! There is a new clicker coming out with four distinctive sounds. I'm on the mailing list for the announcement of when it hits the market, and I'm really looking forward to it. It will make training all 3 of mine together much easier. I haven't found a way to effectively use the standard clicker with more than one at a time.

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I have a question about clicker training an animal. Does it get confusing if you try to use clickers for ... to the wrong thing because he thinks he's doing something right, when in fact it's the horse doing something right.

I can't say for certain, but I don't think it is going to be a problem. When you're working with your dog, a treat follows the click, and you're focused on your dog. When you're working with your horse, that won't be the case. Your dog will figure it out in no time.
When I was first learning about clicker training, I jumped to a wrong conclusion. I thought that the click would come to replace the treat. If that were true, then the confusion scenario you describe could happen. But that's not it. You chain more and more wanted behaviors before giving one click, but every click is still followed by a treat. After the first click with no treat, your dog will think "oh, she's working with the horse" and go back about his business.
Lia