The pool does have a liner. It really depends on the dog and whether or not it will be a problem. First the pool is my parents, we just usse it to wear out the dog and kids . When i used to live with my parents (ages ago, slmost 20 years) at home one of our dogs did cause holes in the liner, but it was because he didn't really swim, he just walked on the bottom of the pool in the shallow end with his back legs, trying tonpop bubbles with his front legs, and he'd go to the edges and splash around with his paws. My parents have had two V's since then, and of course ours visits frerquently and no problems. The dogs are all trained to stay away from the edges, so there is no clawing at the liner on the side, and they are trainedredrover said:Fantastic pictures--that mid-air jump looks fun! Question: Is there a liner in your pool? A friend of mine has a pool and would be willing to let Jasper swim in it, but is worried he'll tear a hole in the liner. I had never known these things existed! Anyway, just wondering if you do, and if so, how do you prevent tears?