Oxytetracycline has expired and can't be given to dogs. Oxytetracycline can be given to dogs. Oxytetracycline is a broad-spectrum antibacterial and anti-inflammatory drug with high safety factor. It is often used to treat gastroenteritis, dysentery, pneumonia and other diseases in dogs. For gastroenteritis, it can be used together with lactic acid bacteria tablets, and the effect will be more ideal.