They might be smelling something that threaten to them . They have an incredible sense of smell and it could be some wild animal they're picking up on. Maybe you should try playing on the grass with your dogs and see this will help them feel safe on it again.
My dog will refuse to go outside to pee if he smell something ,Marty want to get back inside right away. He is a small dog too. And your dogs are not misbehaving , they're acting like dogs.
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