Whether erythromycin eye ointment can be used on dogs with conjunctivitis depends on what type of conjunctivitis it is. If it is bacterial conjunctivitis, it can be applied. If it is viral or allergic conjunctivitis, the effect of erythromycin eye ointment is Not big. When a dog develops conjunctivitis, it is necessary to clean up eye secretions in time and apply medicine on time to avoid aggravation of the condition. If the symptoms are severe, it needs to be sent to a pet hospital for examination and treatment immediately.