How to care my pet Roxie(Dog)?

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I would like to get a new puppy that is a mix of a toy fox terrier and a jack russel. Does anyone have any good websites to visit about taking care of a dog? I never had a dog in my life, so I need to know how much food to feed it, wet of dry food, if it needs a sweter in the winter, how to wash it saftly, ect. ect. Good answers please