Maltese Obedience training-What age?

At what age should I consider obedience training for my Maltese. I have an 8 mo old female who is adorable. She is so playful and cute but at times is quite defiant. She will never come when called. Actually, she will do anything to get us to chase her and will come only in her own time. I am hoping I will be able to control that. Any input would be appreciated. Thanks.
Sandy in Michigan

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