Lethargy or Fatigue: unusually tired or less active than normal

• Possible causes: infections, anemia, heart disease, hypothyroidism

Restlessness or Agitation: pacing, difficulty settling down, or increased anxiety

• Possible causes: pain, anxiety, discomfort, neurological issues

Aggression or Irritability: sudden changes in behavior, growling, or snapping

• Possible causes: pain, hormonal imbalances, illness, or injury

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Loss of Appetite (Anorexia): refusal to eat or significant reduction in food intake

• Possible causes: infections, dental issues, digestive problems, cancer

Excessive Hunger (Polyphagia): constantly wanting to eat or eating more than usual

• Possible causes: diabetes, parasites, thyroid issues, or poor nutrition

Weight Loss: noticeable reduction in weight without changes in diet or exercise

• Possible causes: metabolic issues, parasites, cancer, or malabsorption

Weight Gain or Obesity: unexplained weight gain, often accompanied by lethargy

• Possible causes: hypothyroidism, overfeeding, lack of exercise, Cushing’s disease

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Vomiting: bringing up food, bile, or other substances

• Possible causes: eating something harmful, infections, pancreatitis, or kidney disease

Diarrhea: loose or watery stools

• Possible causes: diet changes, parasites, infections, or inflammatory bowel disease

Constipation: straining to defecate or producing hard, dry stools

• Possible causes: dehydration, lack of fiber, ingestion of foreign objects, or tumors

Abdominal Swelling or Pain: discomfort when touching the abdomen or bloating

• Possible causes: bloat (gastric dilatation-volvulus), liver disease, or tumors

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Coughing: frequent or severe coughing, hacking, or gagging

• Possible causes: kennel cough, heart disease, bronchitis, or pneumonia

Sneezing: persistent sneezing, often with nasal discharge

• Possible causes: allergies, infections, nasal mites, or foreign objects in the nose

Labored or Rapid Breathing: difficulty breathing, panting, or shallow breaths

• Possible causes: heart failure, asthma, lung infections, or fluid in the lungs

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Itching (Pruritus): scratching, biting, or licking the skin excessively

• Possible causes: allergies, fleas, skin infections, or dermatitis

Hair Loss (Alopecia): bald patches or thinning of the coat

• Possible causes: parasites, hormonal issues, skin infections, or autoimmune diseases

Rashes or Redness: red, inflamed patches on the skin

• Possible causes: allergies, hot spots, infections, or irritation

Lumps or Bumps: masses or swellings under the skin

• Possible causes: cysts, abscesses, benign or malignant tumors

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Eye Discharge: watery, cloudy, or pus-like discharge from the eyes

• Possible causes: infections, allergies, injuries, or dry eye (keratoconjunctivitis sicca)

Red or Cloudy Eyes: redness or cloudiness in the eyes

• Possible causes: glaucoma, cataracts, conjunctivitis, or trauma

Ear Scratching or Head Shaking: frequently scratching the ears or shaking the head

• Possible causes: ear infections, mites, allergies, or foreign objects in the ear

Ear Discharge or Odor: foul smell or discharge from the ears

• Possible causes: ear infections (bacterial or yeast), ear mites, or polyps

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Frequent Urination (Polyuria): needing to urinate more often than usual

• Possible causes: urinary tract infections (UTIs), diabetes, kidney disease

Difficulty Urinating: straining to urinate or producing very little urine

• Possible causes: UTIs, bladder stones, prostate issues, or blockages

Blood in Urine: visible blood or a pink tinge in the urine

• Possible causes: UTIs, bladder stones, kidney disease, or tumors

Unusual Genital Discharge: discharge from the penis or vulva

• Possible causes: infections, reproductive diseases, or hormonal imbalances

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Limping or Lameness: favoring one leg or difficulty walking

• Possible causes: arthritis, injury, fractures, or ligament tears

Stiffness or Difficulty Moving: hesitance to jump, run, or climb stairs

• Possible causes: arthritis, muscle injuries, or spinal issues

Trembling or Weakness: shaking or difficulty standing up

• Possible causes: pain, poisoning, neurological issues, or shock

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Seizures: convulsions, twitching, or loss of consciousness

• Possible causes: epilepsy, toxins, brain tumors, or infections

Disorientation or Confusion: acting lost, staring into space, or walking in circles

• Possible causes: cognitive dysfunction, head trauma, or brain disease

Head Tilt or Balance Issues: tilting the head to one side or unsteady gait

• Possible causes: ear infections, vestibular disease, or neurological issues

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Excessive Drooling: producing more saliva than usual

• Possible causes: dental problems, nausea, poisoning, or mouth injuries

Fever: elevated body temperature (above 102.5°F or 39.2°C)

• Possible causes: infections, inflammation, or heatstroke

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Most symptoms listed above may also be caused by vaccination reactions.

Mild to Moderate Reactions

• Lethargy or Fatigue
• Mild Fever
• Slight Swelling at Injection Site
• Loss of Appetite
• Mild Diarrhea or Vomiting
• Soreness or Sensitivity
• Shivering or Tremors
• Coughing or Sneezing
• Increased Thirst or Urination

Severe Reactions (Less Common)

• Severe Swelling or Hardness at the Injection Site
• Facial Swelling or Hives
• Difficulty Breathing
• Vomiting or Diarrhea (Severe)
• Collapse or Weakness
• Severe Itching or Rash
• Pale Gums or Tongue
• Seizures
• Anaphylaxis

What to Do if a Reaction Occurs

Mild Reactions: Often resolve on their own within a few days. Keep an eye on your dog’s behavior, offer water and food if they’re willing, and give them a comfortable space to rest.

Severe Reactions: If any severe symptoms (such as difficulty breathing, collapse, or swelling) are observed, seek immediate veterinary care. Anaphylaxis is a medical emergency and requires urgent treatment.

Always consult with your vet if you have concerns about your dog’s vaccination or suspect a reaction. It’s also helpful to inform your vet of any known allergies or sensitivities before vaccinations.

Homeopathic Remedies for Mild to Moderate Vaccination Reactions

• Thuja occidentalis
• Arsenicum album
• Belladonna
• Ledum palustre
• Hypericum perforatum
• Aconitum napellus
• Pulsatilla
• Natrum muriaticum
• Calcarea carbonica
• Silicea

Click here to read more about indications of the remedies and symptoms treated.