I took it the way that runeword mentioned second, about the spirit. Is that or just have your dog as a dream character?

I'm gonna state my opinion beneath, no hard feelings intended.

Personally I think this isn't a good idea, I think you have to accept the fact that your dog is gone and learn to live with it. Getting in touch with your dog wouldn't replace him right? He would only a projection of your memory, not the real deal.

Whatever you decide to do, my condolences and good luck.