Monitor your dog closely for any changes in behavior or appetite. Increased thirst and urination are common.
Gastrointestinal Issues
- Vomiting Diarrhea Loss of appetite
If you observe these, contact your vet immediately. Adjusting the dosage might be necessary.
Cardiovascular Effects
- Increased heart rate Arrhythmias (irregular heartbeat)
These are less frequent but require prompt veterinary attention. Regular heart checkups can be beneficial.
Other Potential Side Effects
Restlessness or anxiety Tremors Weight changes Changes in coat condition
Note any unusual behavior. Detailed records of your dog’s response to thyroxine will help your veterinarian optimize treatment.
When to Contact Your Veterinarian
Call your veterinarian immediately if you notice any significant changes in your dog’s health, especially those listed above. Regular blood tests are important for monitoring thyroid levels and detecting any potential problems early.
Important Note
This information is for general knowledge and does not substitute professional veterinary advice. Always follow your vet’s instructions precisely regarding dosage and administration.


