Is a spike collar still used for dogs?

I remember that when I was a child, it was standard for dogs to wear prong collars. Recently, I keep hearing that they should no longer be used. Why is that?
I remember that when I was a child, it was standard for dogs to wear prong collars. Recently, I keep hearing that they should no longer be used. Why is that?
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Is a spike collar still used for dogs?Is a spike collar still used for dogs?

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