Depending on what you end up doing to the rest, I might leave the buffet, as is, and paint the table and chairs. Not sure how much diy you'll do, or have it professionally done, but Pinterest has some great ideas for updating the chairs. Adding upholstery to the backs would really change the look. Then paint/finish the table to match.It has a natural division of the top and legs, so you could do the table top differently (maybe a darker stain) than the legs, if you want.

This is a nice, neutral color combo, with a more natural table top:

IMO, the table and buffet look fine as they are. I would re-cover the seats and get a new rug. That rug doesn't go well with anything in the room. Some art on the walls would help, too. I don't think the furniture is the problem. I think it's everything else about the room, and painting the table and chairs won't help. I'm glad you're keeping the cute doggie !