She is a mixed breed (more pinscher) and is perhaps 16 or 17 years old.

She simply doesn't eat anymore. She went to the vet when this started and they found nothing. Gave her some appetite injection, she would eat for two days and stop. Went again and same thing.

I changed vets and he did blood work and everything was fine. He examined her throat with his hands because he didn't want to anesthetize a senior dog for a scan. He discovered a throat and ear infection. Treated and she started eating again, but only for a few weeks. She never gained her weight back.

Now she is only losing weight and not eating, it's been five days since she last eat something.

She sleeps almost all the time and is so thin and her back is so curved that when she drops her head to drink water her rear legs go up and she falls. We had to put the food and water up so she doesn't have any accidents.

She is so frail it's breaking my heart. I'm so afraid.

Update in the comments below, but I'm going to put it here too

Updating here: it happened today.

She got a little better and we didn't had the courage to do it when I made this thread. She was eating better.

But now she started having difficulties lying down and standing up. She would fall, couldn't lie down by herself. I had to help her.

This night her bed was a little wet and I figured she might have pissed while lying down.

Talked to the vet and she is gone forever.

But I didn't had the courage to watch and be with her during the procedure. I am dying inside because of this. I loved her so much, she was with us for almost 18 years...

I will never see her again.

Thanks for everything Meg and sorry for letting you down.