by 
The Curious Bag
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Dogs with loose, saggy skin may be suffering from a genetic disorder that reduces the level of collagen. This disorder occurs in adult dogs, and it may cause joint pain, skin tearing, and bruising. This disorder is cutaneous asthenia.
Skin Disorders
If the dog is not suffering from a poor diet and does not have a existing skin disorder such as eczema, one possible reason for loose, sagging skin could be a lack of collagen. This disease, cutaneous asthenia, is a genetic disorder, and it has no cure.
Causes
Cutaneous asthenia can affect any dog, but some dogs are more likely to develop the disease because it is a genetic condition. The lack of collagen causes the skin to lose elasticity. The joints become weak as well.
Treatment
Since the disease has no known cure, careful monitoring is the best way to keep the disease from causing unnecessary pain. Loosening restraints, keeping the pet away from children, and avoiding physical trauma are important in the care of pets affected with cutaneous asthenia.
Diagnosis
Adult dogs should be taken to the veterinarian for diagnosis.
Skin Care
Prompt attention to minor cuts and abrasions can help prevent infection in animals affected by skin disorders.
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