Not inherently, but you need to be careful. Many lawn lovers swear by a coat of lime on their garden soil, increasing the pH level to ensure that their plants get all of the nutrients needed to thrive.
Either in the form of a lime pellet or literal limes, using these on your lawn is generally considered to be safe for canines, so long as you take some precautions. The first of which being: never to use quick or caustic lime.
Although these get the job done faster, it has a tendency to irritate the skin of humans and pets alike, so unless you’re willing to keep your dog off the grass for a couple of days, you should steer clear of the heavy-duty stuff.
However, powdered lime made from calcium or other materials might be non-toxic, but they aren’t totally safe for your pup. Sure, they won’t get seriously ill, or die, but it could irritate the eyes, skin and lungs of your canine companion.
As such, once the lime dust or pellets have been spread, you should ensure they are completely absorbed by the soil before you or your dog comes into contact with it. Watering thoroughly or allowing a huge rainstorm to drench your lawn first is best.
This ensures that the lime is either completely integrated or in such a small concentration that the risk of ingestion, inhalation or skin contact is very much reduced for your dog.