Litter pans are a problem. Especially when you have a large cat who can't fit in a small litter box and a dog who considers cat poop a delicacy. It's been a struggle to find a commercial litter box the cat can enter and the dog can't.
On average, the cost to have an above ground pool deck professionally installed can range anywhere from $2,500 to as much as $8,000. The costs really come down to the type of material being used, the size of the pool, the design and contractor building the deck.
The typical 19' diameter round (283 sq.ft. of water surface area) above-ground pool will typically cost around $13 per square foot when purchased as a kit-package of material. Adding all labor and typical extra features will raise that cost to around $29 per square foot.