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Starting to wean my pup at 3.5 weeks

Mother is drying up a little now as puppy has started nursing only 5 mins every three hours. He is refusing to lap or bottle feed, wanting mum only. He eats raw beef mince, Advance Rehydratable Kibble and tin meat - I alternate. He is not interested in water. I am concerned as I had 10 live pups - The vet and I lost 9 in the first 2 weeks as they were too weak - fading puppy syndrome am told. The remaining pup seems to play a little and barks at his mum but is not as playful as previous litter. What to do??