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If a dog wags its tail, it wants to make friends
Indeed, friendly dogs wag their tails. However, tail wagging can also express excitement, anxiety, submissiveness, or appeasement. Watch for other body language displays in dogs to understand their true intentions.

Dogs need to be bathed frequently
If your dog is dirty or smells bad, then he really needs a bath. But don't bathe your dog just for the sake of it, bathing too often will strip the skin of its natural oils, which can lead to irritation and cause dandruff. Regular grooming will help keep the coat clean.
If your dog is not dirty - he does not need a bath!