Shipping Container Kennel
Maybe something similar to this, but a bit smaller, for the ducks?
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backyard dog potty area - Google Search
Amazing #Whelping Box Designs - Tap the pin for the most adorable pawtastic fur baby apparel! You'll love the dog clothes and cat clothes! <3
Cattle Wire Fence for Dogs | Building a Dog Run
A Garden Gate made from an old screen door! OR an old metal door!
Side Yard Dog Run