Hydrangeas are popular shrubs with colorful flowers that bloom through summer and into fall, in the shades of blue, violet and white. They are very popular decorative plants and can be found in many homes and gardens so for this reason, some dog owners might ask are hydrangeas poisonous to dogs? And yes, hydrangeas can be toxic to dogs but the level of toxicity depends on the specific variety of hydrangea and the amount ingested by the dog.
Ingestion of large quantities of hydrangea leaves or flowers can lead to more severe symptoms, such as difficulty breathing, increased heart rate, and even cyanide poisoning. If you suspect that your dog has ingested hydrangea, it is important to seek veterinary attention immediately.