At six weeks the puppy should still be with its mother. However, the advice given above is good, if you have no alternative you can use cow's milk but make sure it's NOT cold, should be body temperature, NOT warm or hot.
Should I Feed My 6 Week Old Puppy Milk?
If you give your 6 week old puppy milk make sure that you don't give him or her a lot because they will get worms.
I am planing to feed my 6 weeks puppy with dog milk until is 2 months all it is correct?
No, not milk form a cow but you can go into your pet store and find some DOG milk that will work.