Douglas Fir 'Waggin Tails' Discovered on Wagon Trail Road adjacent to a dog grooming business called Waggin Tails, this dark green, sweet smelling tree has whimsical branches that curve and twist like the wagging tail of a dog. Dark green needles cover an upright full formed tree that grows at a slower pace than the species forest tree. Mature height 12 ft and 8 ft wide.