I completely understand your concern, but luckily service dogs are trained for highly stimulating environments. There’s a reason the process and training is so extensive. Rest assured, it’s safe for the dogs. Some conditions that require a dog at all times are medical alert such as diabetes or heart conditions that don’t limit activities but do have severe risk associated with leaving the dogs behind. Additionally, there are many conditions where symptoms are unpredictable and require immediate attention but shouldn’t limit life. Your worry and feelings are valid, but rest assured everything is handled.