Yes it's a snake plant; don't know which exactly. Why are you eager to repot, due to the heavy mix you say they're in? I'd hold off on watering it for a while, give it bright indirect light or if you want to give it more light, increase the exposure gradually. If you change the mix one wants to make it porous & fast draining. I'd add a lot of pumice, or if you can't get that use perlite, to cactus & succulent mix. Try to avoid mixes w/ peat, they can become problematic. Less is more w/ these plants, they do best w/ a fair amount of neglect. There's a Sans. forum at GW if you'd like to take a look & read their care, but it's a pretty slow going forum.

Was his belly a pinkish tan? He looks like a wormsnake to me, but it's a little hard to tell from that shot. They do look like oversized earthworms and tend to be fairly calm snakes, rather shy, actually. They are an indication you have great soil (lots of humus & worms), and are completely harmless. Do tell your wife.

Dan - How would you "teach" a dog to leave snakes alone? A water snake, a racer, or a rat snake trying to look dangerous doesn't look like a rattlesnake or a copperhead. They may have the coiling and tail thrashing OK, but their posture is wrong, and they aren't rattling. Hognoses do their cobra imitation, which widens their neck even more compared to their head, while copperheads and rattlers either don't or can't do that and maintain the distinct indent at the intersection of neck and head. And the entire skull shape is distinct - angular muzzle, eye ridges more prominent, rear of head is heavily muscled behind the jaws. I am fortunate around here because if it doesn't have rattles, it's not poisonous enough to worry about. If I found a rattler in my yard, I would carefully drop a plastic bin over it, slide the lid under the bin, fasten it securely and then relocate the snake to the nearest arroyo or rocky hillside. They eat rodents. The local rodents may carry bubonic plague and Hanta virus ... the snakes are on my side. To be bitten by a rattlesnake, it helps to be male and drunk. I used to win bets in the AZ hospital's ER when the dispatcher announced incoming snakebite victims. I'd bet the new interns $5 that the patient would be male, 16-30 and have a blood alcohol at or above the legal limit. I lost one bet in 2 years - that patient got a flat tire, and stepped on the snake in the dark as she walked around her car to look at the tire. The others were all drunk and doing stupid things with snakes.

Yep definitely a harmless water snake. It's a Diamondbacked Water Snake (Nerodia rhombifer rhombifer).