We've got 2 Weimeraners that love to swim. We have an in ground, vinyl pool, and have taught them to enter and exit only at the stairs. This prevents them from tearing the liner with their nails. Strategies I'd use for an above ground pool would be to keep the dog's nailed trimmed as short as possible, getting fiberglass stairs that sit on the bottom of your pool and teaching your dog to only use these to enter and exit your pool. You can also buy booties for your dog , which will protect your liner, here's a link to one type...http://www.amazon.com/Granite-Gear-E.../dp/B000XUO8NC. These booties don't help with our dogs because they often swim when we are not in the pool.

When our kids have friends over, our 2 dogs will line up to take their turn jumping off the diving board, it's hilarious. Good luck, and with care, your dogs can enjoy your pool without destroying it.

Tom