The question is . . . do you want to maintain a swimming pool just so you can water your plants? At best, it will be a weekly 30 minute chore to maintain.

Also, during drought you'll need to cover the pool to avoid evaporative loss, but if you do, the dogs can't swim, unless you remove the cover. And, if you try to put the cover on and off, you'll have to worry about them getting into the pool when you're not watching, ending up UNDER the cover, and drowning.

You might want to get a 25,000 gallon pool for the plants and a 5,000 gallon Intex pool for the dogs.