Grow sweet strawberry in a vertical PVC tube is great solution for small garden or yard. Vertical planter will save you a lot of space, at the same time keep plants out of reach from garden insect pests AND enable you to switch to hydroponics.
I'd use flowering shrubs rather than evergreens, a few different kinds, and arrange them in a reverse symmetry.] A long, thin garden with plenty of room for puppy to play and lots of privacy from the neighbours.
I like the contrasting surfaces but not gravel because of Charlie. I also like the trelliswork on the right-hand wall. Chairs with cushions around brazier in small urban garden, clipped box balls, Mespilus germanica