Is My Dog Allergic to Glucosamine?

Glucosamine is a vital supplement for strengthening dog joints. The supplement application is common among older dogs with joint cartilage medical conditions or pets suffering from dysplasia.

Pups with arthritis and other medical joint conditions also receive the dosage. However, different dog breeds tend to develop mild to fatal allergies resulting from the administration of glucosamine.

Dog symptoms of glucosamine allergies

Glucosamine allergies in pets are inevitable. The dosage is primarily through shellfish food products, which make a large percentage of the pet diet.

As a result, dogs with shellfish allergies exhibit similar allergic reactions and symptoms identical to glucosamine allergies. Below is a compilation of top glucosamine reactions your pet is likely to develop as an allergic reaction.


Abnormal stool production is one of the easiest ways to know if your pup is sick or suffering from an allergy.

Diarrhea manifests when bowel movements become watery and loose. It occurs when the fecal material in the bowels undergo minimal nutrient absorption, water, and, lastly, electrolytes. In a day, dogs exhibiting diarrhea have a higher rate of defecating, unlike healthy dogs.

The high defecating rate may persist for days and even weeks. Acute diarrhea involves the presence of stool in blood, dehydration, and weight loss.


Vomiting is a normal phenomenal in dogs. It may result from food poisoning, bacteria infections, among others. However, sporadic vomiting lasting for a long time is one of the typical allergic reactions to glucosamine dosage.

Pet owners should, therefore, be keen on monitoring the intervals and periods of animal vomits. It is advisable to seek immediate clinical help to prevent the pet from developing other infections such as bacterial that might severely affect the dog.


Pups may experience drowsiness and weakness, commonly known as lethargy. Unlike fatigue, drowsiness in animals manifests as a lack of motivation and will.

Stronger medicines such as glucosamine are known to slower the animal’s metabolic reactions and joint activities. Some of the symptoms include the pet engaging in very short walks or refusing to partake in tasks like jumping or walking up the stairs.


Insomnia is a rare condition in dogs. However, it majorly manifests in younger and much older dogs.

The main cause of fatigue is when dogs suffer from internal pains or dehydration due to diabetic-reactions. As a result, sore body parts or continuous thirst for water will prevent the animal from having a peaceful night or day sleep.

Pet owners with house dogs are sure to identify insomnia cases much easier. Just like humans, lack of sleep will result in a grumpy and inactive pet.


Most dogs are generally active by playing, running, and barking. Dogs with allergies will tend to lie down for most of the day or act lazy during involving activities.

You can note the animal’s fatigue characteristics by observing the dog’s behavior and reaction concerning past activities such as ball-throwing games daily walks and barking.

Even though fatigue might pass after a while, pet owners who are keen on their dog’s behavior will immediately identify the sudden inactivity behaviors in their dogs.


Just like humans, several dogs suffer from diabetes. As a result, pets are sure to exhibit allergies arising from high sugar diets. From the name glucosamine, the supplement’s chemical composition consists of high levels of glucose sugar.

The joint supplements are known to shoot up the concentrations of blood sugar levels. Additionally, the animal’s body can only absorb a minimal percentage of the high glucose levels as a source of energy.

Pups will, therefore, suffer from diabetes mellitus. Some mild symptoms to expect include thirst and urinating from time to time.

The animal will also lose bodyweight and develop an abnormal appetite. Since the body does not absorb enough glucose, insulin production levels drop; hence cells lack adequate energy to perform their metabolism tasks. The high insulin levels concentrate in the blood leading to hyperglycemia.

Allergic reactions

Since glucosamine administration is through shellfish products, your pet will show different signs of allergies. Some mild allergic reactions include your dog chewing parts of its feet, such as paws and nails.

Severe allergies may have your pet undergoing anaphylactic shock. Anaphylaxis manifest through the route of exposure of the glucosamine, which is commonly through the mouth (eating).

Some clinical signs to look out for include itchy body parts, red spots on the skin, and swellings on the mouth and face.

Some dogs experience excessive salivation or drooling and frequent vomiting and diarrhea. Systematic allergies include pups facing a hard time breathing. A severe case of allergic reactions is cyanotic development, where the color of the tongue and the gums turn into a shade of blue.

Blood-thinning and excessive bleeding

Dog’s blood contains a blood-thinning component known as chondroitin. Administration of supplements such as glucosamine results in the two interacting hence lowering the blood clotting capabilities.

As a result, your pet may experience excessive bleeding resulting from shallow cuts or accidents. Lose of blood might lead to the development of other fatal blood diseases such as anemia.

Excessive painkiller reactions and side-effects

When the glucosamine component reacts with anti-inflammatory drugs, the result is fatal to the animal’s body. For example, dogs receiving painkiller dosages from injuries can express mild to deadly side effects to the joint and muscle supplement.

Pet owners should cease from administering their pets with painkillers once they start getting glucosamine doses.

As a pet owner, it is vital to understand the allergic reactions your dog might undergo during glucosamine administration. Most allergies resemble shellfish reactions and dogs with other health conditions.

Pets with large bodies such as German Shepard and old dogs are likely to develop muscle and joint difficulties. However, allergies might manifest among other breeds despite their age and body-built.

With observation, spending more time with the dog, and regular clinical checkups being the best methods to identify glucosamine allergies. Real dog owners should consider the above signs and make appropriate decisions.

On the positive, most glucosamine allergies and reactions are mild and manageable.

1 thought on “Is My Dog Allergic to Glucosamine?

  1. Kristina Greenwell

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