I just put in a vinyl pool with vinyl-covered steps. My PB swears it'll be fine with my 60-lb doodle using it. Our dog is good at using the steps in the other pool we visit, and we keep his nails short and Dremel-sanded, so I'm hoping we won't have problems! I think that if they never try to exit somewhere other than the steps, it should be ok. I'd feel better if I had fiberglass steps, but I wanted the look for steps all the way across the shallow end. One thing I'm considering is putting some sort of cover/protector on one part of the steps and training him to use that area for exiting. I haven't figured out what to use yet though. If we get a tear, we'll fix it, and we'll figure something else out. (And I'll be sure to tell my PB she was wrong!)