If the dog does not consume the food of sufficient quality protein and essential amino acids, it can develop protein and amino acid deficiency. The main sign of this are brittle, bleached hair that falls out easily and slowly recovering. Lack of tyrosine, tryptophan and cysteine amino acids may affect the formation of skin pigments and hair. Such a deficit occurs in those dogs in the diet consists of only cereals. Chronic deficiency of sulfur amino acids methionine and cysteine leads to hair loss in dogs. Deficiency of proteins and amino acids most commonly found in dogs fed an unbalanced diet, containing a small amount of animal protein. In adults deficiency can occur after months or even years. You'll soon be able to notice such problems in the growing puppy, because they affect the pace of its growth.

Deficiency of minerals

Deficiency of minerals is most often caused by an imbalance of minerals and their antagonists are present in food. In particular, a secondary zinc deficiency often occurs because of excess calcium in the diet, which prevents the absorption of zinc. Or zinc may simply not absorb by the body, as it binds all the phytate. 

Phytates - a complex organic substances containing phosphorus. They are contained mainly in the fibrous grains and can bind such elements as zinc, preventing its absorption from the gut. Signs of zinc deficiency may be hair loss, skin thickening (Para keratosis) and the disappearance of pigmentation. Scientists have found that the effect on the content of zinc in the body and found that it is very important for the optimum condition of the skin and coat. Some breeds are particularly vulnerable to zinc deficiency. For example, a Siberian husky and Alaskan malamute prone to dermatitis, caused by his fault. The disease usually begins at puberty and is expressed in the formation of scabs and flaking, the appearance of redness around the mouth, chin, eyes, ears, and in places exposed to the pressure that is on the elbows and knees. May also be affected paws and genitals? In this case, the introduction of zinc in the diet gives a good result. Another syndrome develops in puppies of various, often large rocks. The skin on the head, torso and legs red and covered with scabs. 

History of feeding these dogs often indicates excessive levels of calcium and high protein intake of vegetable origin. But on the other hand, we must remember that dog's needs a small amount of zinc, and increased his doses are toxic. Baldness often associated with iodine deficiency or a metabolic disorder of the thyroid gland. Since the metabolic disorder is the cause more likely than a simple lack of minerals coming from food, to establish an accurate diagnosis is better to turn to the veterinarian.