My pup is a year old. We have the same issue as you. We can never let her go freely in our large fenced in yard as she loves to put everything in her mouth. Rocks, leaves, mulch, acorns, sticks, grass etc you name it. Ours understands the leave it command and will do it in a controlled setting in the house. But when we are outside and I tell her to leave it she looks at me as if I am talking Portuguese. I think she is just so intrigued with all the “treasures” she finds outside. Hopefully in time she will outgrow this.
