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Seeing lots of dogs walking off leash in public parks now that dedicated dog areas are locked up during the lockdown. Some look like new owners with new puppies.
Not everyone likes dogs. Some are allergic. Some are deathly scared. Dogs can also react to sudden unexpected movements in surprising ways. Even if you lose your grip on a leash, it's easier to catch a leash than the unleashed dog.
Keep your dog on a leash at all times in public. For everyone's safety, including your and other dogs.