Hello - Finally have the pool installed. Now the next issue...I have 3 dogs and they love to get in the water. My youngest golden retriever has arthritis and it is hard for her to get in and out of water-but she needs to swim for the exercise. I am looking at the Vinylworks Entry System and the Neptune Step-A-Frame ladder Entry. Does anyone have either one of these stair systems? They look very similiar - but have about a $200 difference in price. If you use something else that would work great for dogs, I would appreciate it if you would share the info. Thanking you in advance, Bob