In this section, we take a look at the most toxic and potentially deadly foods, plants, and essential oils for dogs. Toxicity Symptoms Toxicity symptoms in dogs include: DepressionLoss of coordinationParalysis of the rear legsVomiting – possibly bloodyLow body temperatureSkin irritationStomach irritationLow blood sugarLiver disease/failureRenal disease/failureDiarrhea – possibly bloodyFluctuations in heart rateAgitation or lethargyTremorsSeizuresDroolingWeaknessLoss of