My dog has lost a bunch of weight and seems like he can't see

How old is he? What does the vet say?

I know vet bills are expensive but I bet your doggy is worth the money.. he/she might be in pain

That's not a lot to go on, but it does sound as if you need to get him to the veterinarian.

We got him in 05 but he doesn't act like he is in pain

So he is at least 7 or 8 years old? For on older dog this could be a number of things, from diabetes to cataracts coupled with other things like kidney or liver disease, the only way to know for certain is to get him in and have him checked out by a veterinarian.
Please take him to the vet, he shouldn't be left to go on like this.

Does he get his yearly check ups and shots from the VET ?

Have you taken him to the Vet to see what could be wrong?

I have had one dog that was completely blind, and another dog who lost eye sight as he got older. They require special attention.