You know not to feed your dog chocolate, but what happens when your dog becomes curious about some plants in your yard? There are some common flowers, according to the American Society for the Prevention of Cruelty to Animals (ASPCA), that can be extremely dangerous to pets. When it comes to planting your flowers, here are 11 plants to be cautious of if you have pets. If your pet shows any sign of illness or if you believe they have ingested a plant that may be toxic, it's time to call your vet.