Help Cover Dobby's Vet Bills

Our little man, Dobby, needs our help! Our favorite little tiny dog is having some health problems. For the last few weeks, we have taken Dobby to the vet a few times and $1000 later we still are not sure what is going on with him other than arthritis/dysplasia and a protein absorbtion problem, but he has lost about 25% of his body weight and he isn't gaining it back. We have changed his diet and added new medications to his regimen, but he is stagnant. He can no longer make it up his steps, and is urinating in his bed because he can't make it anywhere else. He can't even seem to lift his head to look at me, which if you've ever met this bundle of joy, you know this is uncommon behavior for him. He is only 9 and has led a very healthy life up to this point and I am terrified for his health to suddenly decline. I have set the goal to $3000 to cover expenses we already have and to cover his overnight vet stay so they can run additional tests to see if they can figure out what's wrong. Hes losing hair on his legs, is down to a bit over 9 lbs, and hardly moves. Please help me get Dobby back to health. He deserves the world.