An adjustable platform assembly attaches to a tree to provide a hunting dog perch or a seat for a hunter. The assembly includes a tree hugging subassembly having first and second padded tree engaging members connected together by a hinge, and strap fasteners connected to outer side edges of the tree engaging members for securing the assembly to a tree. A first frame member is attached to the tree hugging subassembly and is pivotally adjustable about a first axis that extends generally perpendicular to the tree and perpendicular to a first plane. A second frame member is attached to the first frame member and is adjustable about a second axis that extends generally parallel with the first plane. A platform attached to the second frame member can be adjusted to a desired horizontal orientation by adjusting the first and second frame members about the first and second axes.