What do you want to ask about dogs?

My dog has diabetes and is now on 18 units of insulin a day. He started to urinate in the house and want to go out every hour. At the same time he was ravenous. Had a urine test done and the vet feels that some underlying infection/disease may be counteracting the insulin as his sugar was very high. He mentioned Cushings Disease, and I am beside myself. I know it would cost about $100. per week for the medication, plus his insulin. To find out exactly what is doing this would involve more testing. I am almost broke having spent hundreds of dollars on him. If he does have cushings I could not afford the meds, and would have to put him down. I don't know what to do-I am heartbroken. He is a Pom and almost 11 yrs. old. My only companion. Please help me. Thank you Bonnie email address pbroad1@hotmail.com