The Dolphin complex at West Edmonton Mall was actually slightly more expansive than meets the eye! Along with the main pool, there were two other pools to the complex. A smaller off exhibit one that would be drained for medical reasons, and a second pool, larger than the medical pool but smaller than the show pool, that allowed for underwater viewing of the dolphins.
Perhaps a bit sadly,however, the dolphins seemed to give a large preference to being in the medical pool or show pool, as I can recall perhaps one time when I saw a dolphin in the underwater viewing pool, over the many times I visited while they were there (the attraction has gotten rather worse over the years, and I visit rarely now)
The facility itself wasn't actually half bad for the time when it was constructed, being ~25-30 feet wide, ~40-50 feet long, and I can't recall where I heard it but I believe the pool is about 17 feet deep, and personal observations from going on the submarine ride solidify that. It still currently falls under the legal size requirements requirements for housing bottlenose dolphins in Alberta, and actually surpassed them somewhat! The size of the habitat was was hardly the undoing of the animals, but rather the management of the animals. If they had used proper barriers to ensure that it would be more difficult to throw things into the pool, and used different water treatment protocols, I would not be surprised to see they still house dolphins today. The calf survivability could have probably been helped by better water management as well, however sometimes despite the absolute best of care they still sometimes fail to thrive.
The mall still does do Sea Lion kisses (and a swim with the Sea Lions program that just opened up a few years ago), however in the past 5-7 years, the mall has severely cut down on anything that really made it noteworthy. Although there are still the large attractions, many of the themed areas have been drastically scaled down, or removed all together, and now the mall is distinctly losing what once made it special. It now feels like visiting any other bland mall (aside from ridiculous crowds and more walking), as opposed to an adventure, like it used to. Quite sad, really.