18/01/2026
𝗖𝗼𝗻𝘀𝗶𝗱𝗲𝗿𝗮𝘁𝗶𝗼𝗻𝘀 𝗼𝗳 𝗛𝗼𝗺𝗲-𝗣𝗿𝗲𝗽𝗮𝗿𝗲𝗱 𝗘𝗹𝗶𝗺𝗶𝗻𝗮𝘁𝗶𝗼𝗻 𝗗𝗶𝗲𝘁𝘀 𝗳𝗼𝗿 𝗗𝗼𝗴𝘀
Elimination diets are a cornerstone in diagnosing adverse food reactions in dogs, which require careful planning to ensure both efficacy and safety. Many home-prepared elimination diets, particularly those intended for adult dogs, are not nutritionally balanced. These diets are often limited to one or two protein and carbohydrate sources, which makes them adequate for short-term use (typically 4–8 weeks) but unsuitable for long-term feeding (more than 8 weeks). Prolonged feeding of an unbalanced diet can lead to significant nutrient deficiencies, especially if owners attempt to extend the elimination trial beyond the diagnostic window.
𝘾𝙤𝙢𝙢𝙤𝙣 𝙉𝙪𝙩𝙧𝙞𝙩𝙞𝙤𝙣𝙖𝙡 𝙂𝙖𝙥𝙨:
Homemade diets frequently lack calcium, essential fatty acids (EFAs), and certain vitamins and trace minerals, while simultaneously providing high levels of protein. High protein intake can paradoxically worsen allergic responses, as intact dietary proteins are more likely to act as antigens and trigger hypersensitivity. In addition, diets that are high in phosphorus but low in calcium, or with an inverted calcium-to-phosphorus ratio, can cause skeletal abnormalities in growing dogs. Deficiencies or inverse ratio of EPA and DHA and a lack of zinc, vitamins D3, E and A can further contribute to the atopic dermatitis symptoms the elimination diet is aiming to treat.
𝙋𝙪𝙥𝙥𝙞𝙚𝙨 𝙖𝙧𝙚 𝙋𝙖𝙧𝙩𝙞𝙘𝙪𝙡𝙖𝙧𝙡𝙮 𝙑𝙪𝙡𝙣𝙚𝙧𝙖𝙗𝙡𝙚
Dogs under 12 months of age are at highest risk of nutritional deficiencies due to rapid growth, high metabolic demand, and immature digestive and absorptive systems. Clinical signs of deficiencies can develop quickly:
- Thiamine (Vitamin B1) deficiency can cause anorexia and poor growth within 10–20 days of feeding an inadequate diet.
- Imbalanced calcium-to-phosphorus ratios may lead to skeletal disease, including osteopenia or abnormal bone development, after only four weeks of feeding.
- Deficiencies in essential fatty acids can impair skin barrier function, leading to scaling, alopecia, and increased susceptibility to inflammation or secondary infections.
𝘽𝙖𝙡𝙖𝙣𝙘𝙞𝙣𝙜 𝙖𝙣 𝙀𝙡𝙞𝙢𝙞𝙣𝙖𝙩𝙞𝙤𝙣 𝘿𝙞𝙚𝙩
If a home-prepared diet is required for longer than eight weeks, it is crucial that it be formulated to meet all nutrient requirements appropriate for the dog’s life stage. This includes:
🦴 Adequate levels of calcium and phosphorus in the correct ratio
🐟 Essential fatty acids, particularly omega-3 and gamma-linolenic acid
🥚 Vitamins such as A, E, and B-complex
🦪 Trace minerals including zinc, copper, and selenium
Professional guidance is highly recommended when designing a long-term home-prepared diet for a dog with protein allergies or food intolerance. Depending on the server of the dog's allergies, a commercial nutrient supplements may be necessary to correct the inevitable gaps. Failure to appropriately balance the diet can compromise growth, coat and skin health, immune function, and overall well-being. However, with an understanding of what the dog can and cannot tolerate, a diet free from synthetic supplementation sometimes can be formulated.
