Aloe vera
Although great for burns and healing with human, Aloe Vera is extremely toxic to both dogs and cats. Make sure it always kept of reach from your pets.
The reason Aleo Vera is dangerous for our pets is because it contains anthraquinone glycosides which are purgatives (medications that encourage bowel movements) Once eaten by your pet these glycosides are metabolized by bacteria in the intestines which causes increased mucus productions and water in the colon. Symptoms can include vomiting, diarrhoea, changes in urine colour and anorexia.
A Vet should ALWAYS be consulted immediately if you fear your pet has eaten any kind of toxin.