Keep the dog and your son separated unless you are in the room. Â If you have a dog crate, keep the dog crated or use a baby gate to keep them separated. Â Most three year old children shouldn't be around dogs unsupervised around dogs no matter how much you trust the dog or the child. Â It's too easy for them to get knocked over, jumped on, or bitten. Â It's not really developmentally appropriate. Â Yes, keeping them separated is a pain and often inconvenient, but it's probably best under the circumstances.
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What you tell your son is "That is private. Â You don't let the dog touch your private parts (or whatever word you use)." Â If he argues with and says it's okay. Â You say, "No, it is private." Â
Deal with it calmly and matter of fact. Â Without knowing your history, it's a serious red flag to me. Â While you may want to avoid CPS, I would take him in as soon as possible.Â