Looks like a Schefflera to me.

Any suggestions for a non-toxic replacement that would look good in a large pot, be fairly tall, and survive in 50's inside temps?

The plant you have is very durable and fixable if you want to tackle it? It just needs cutting back & a repot. Looks like lack of light is an issue, too. Have you fertilized at all? Consider the question moot if you plan on discarding it.

Al

Looks like Dwarf Shefflera aboricola.

What size is its pot? It needs brighter light..just to be cautious, check for insects. Foliage is somewhat pale..Toni

phrog, I'm assuming that you've looked up the toxic qualities of your shefflera and have decided to get rid of it when your new puppy comes into the home.

As far as a replacement goes, it might be a good idea to hold off on the floor plants for awhile...at least until the pup gets out of the chewing, mangling, dragging things around, knocking things over stage.

Rhizo, you get to the heart of my question. The existing plant is going to horticultural heaven soon. We don't want to revive it. And we can certainly wait to find something else.

Good idea, on both counts! That poor plant either needs to be put out of its misery (no offense, lol) or adopted out to someone who can do some real R&R on it. REVIVAL and recuperation. As tapla suggests, it's a fairly straight forward process for this particular plant....but not one you need to undertake with a puppy coming into the home.

RIP, Shefflera.