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Some dogs will lick various objects when they are lacking specific minerals. Often licking everything is a sign of stomach upset or even seizure activity. However, licking and sucking on sheets and blankets are usually a sign that a dog has been taken away from their mother too soon. It becomes a way for them to calm themselves. In a lot of cases, the dog is actually suckling the material which is why it is wet.
If you are concerned that your dogs may not be getting the necessary vitamins and minerals from their diet, you might get some nutrical from your pet store or vet and use that to supplement their diet and be sure they are not suffering nutritionally.
Now the chewing of the other dog's feet and scratching does concern me as that can be a sign of allergies or even mites. Some mites are contagious. Your vet can do a skin scraping to determine if mites are a problem and treat appropriately. Allergies is a little more difficult to pin down since a dog can be allergic to anything. It might be to a food item, treat, cleaning supply or even trees or grass pollens or shampoos. Thyroid imbalances can also lead to paw chewing. Benadryl can be given to a dog for allergies at a dosage of 1-2mg per pound every 8 hours. That may help with any allergy symptoms she has.
Dogs often get a dermatitis as a result of the scratching and licking associated with an allergy. Often this is a yeast dermatitis and can lead to ear infections and yeast dermatitis between the toes. You can try some miconazole cream on the paws to see if it helps but it isn’t a cure for underlying condition. You can read about allergies here:
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