Adult dogs or puppies who have been weaned should not drink milk or cream, or indulge in any other dairy products. A few licks per week as a treat is acceptable, provided the dogs does not later show signs of lactose intolerance.
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Significance
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Milk and other dairy products contain a sugar called lactose, which needs to be digested by the enzyme lactase. According to PetEducation.com, most adult dogs do not have lactase.
Identification
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The "Dog Owner's Home Veterinary Handbook" notes that symptoms of canine lactose intolerance include vomiting, diarrhea and intensely itchy skin. The skin may be red or have pus-filled lumps on it.
Misconception
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Dogs do not instinctively know what foods are good for them and what are bad. As you've probably noticed, puppies and dogs put absolutely everything into their mouths.
Alternatives
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Lactose-free dairy products are commercially available for dogs, including an ice cream product called Frosty Paws. If you are caring for an abandoned puppy, purchase canine milk replacer at a pet store or from your veterinarian; do not feed him cow's milk.
Speculation
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Puppies are usually weaning by the time they are 8 weeks old, but not all will grow up to be dogs with lactose intolerance. However, a dog that can digest milk is the exception rather than the rule.
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