So the Prednisone did help: she got back 1.5 times her appetite, her mobility, herself. -no more coughing!!

But nights are very tough; we do give her trazadone and still panting from 9ish till 12 non-stop and then periodically till 2am and then it gets better. We think she is suffering and there is nothing we do that helps her. Her breathing is never 'slow' and it seems hard.

My hubby is convinced it is time to say goodbye. I believe he is also afraid thing can get unmanageable (pain) and does not want her to go through worse suffering. It is hard to see her panting and not to be able to help. 

I cannot make the decision, I know I am being selfish too, i cannot even think of not having her. 

Sorry, I needed to share, I know many of you had gone through similar nightmare and I wanted to hear your advice (if there is any)

Thanks for sharing your thoughts and own experience, Jackie. 

I am just not convinced though you said, it is a question of days probably and the vet that we last spoke said that the tumor produces liquids and it gets bad so better do it before because we'll regret of she gets there. I believe that is what makes my husband so sure together with the fact that her breathing is always fast-paced now and the nonstop panting at night. This is so hard for me, i know i have to be present for my Belle and don't know how i will do it. :'(

Jackie, Virginia & Jerry & everyone: I want to thank you from the bottom of my heart for being here for us. Your words and guidance gave me comfort, knowing they come from loving beings that unfortunately had already experienced all this pain and nightmares. 

My husband was ready to take her last night, frustrated that Belle had no peace panting and struggling to breathe and that nothing we would do or give (trazadone) would help not even a bit. I did not want to end it like that and wanted to be with Belle and my husband but I would have had to stay with the kids -who were already sleeping. (I have little ones)

So this morning my husband took them to my in-laws and we spend a beautiful day in the back-yard, had BBQ home-made burgers with tomatoes, frozen yogurt and tons of liver treats. Then we headed to the park, next to the pond (she had a hard time doing more than 2 steps, so Steven carried her) and we stayed looking at the ducks and other ppl and dogs that passed by. She was happy. Her condition has been deteriorating day by day, today -despite of the meds- her cough was back, i believe she already had liquids in her lungs (her lesions from the xray +2 weeks ago were big) We could have waited probably a couple of days, with tons of luck till next weekend but we were told we would regret waiting until last moment. Belle crossed the bridge this evening, she went very peacefully with morphine and sedatives and she even wagged her tail to the vet. Vet also reaffirmed our decision, saying that with lung tumors you dont wait til things go bad. 

Think about the perfect dog, Belle exceeds anybody's expectation. I loved and still love my pup, and I already miss her like crazy. Life won't be the same without her. She's been a blessing in our life. 

@Virginia: we could not really observe a clear difference with the Trazodone or without, my husband was convinced something was really wrong and that she was struggling to breathe. I did find that she could nap kind of easily during the day but each day got worse and the panting would occur for short periods during the day as well. Her breathing was fast all day long and had been like this for the past 2 weeks at least. Moving her from the bed to the floor worked at the beginning to control a bit her panting but did not work the past few nights. I moved to the floor with her, just to be next to her and for her to know I was with her. Nothing we would do (like massage techniques we learnt, etc) would help. 

@Jerry, reading your post "Better a day too early than a day too late" reaffirmed our decision. 

Also @Jackie's words "When you cannot control the fluid in the lungs then it for sure, without doubt, is time. I have been in the middle of this procedure and in my honest opinion is just prolonging without quality of life. "

Not sure how advanced those fluids were, but they were there, she's been coughing a lot this afternoon. And we questioned her quality of life: not more than a couple of hops before she ran out of breathe, she still enjoyed food and was overly hungry and wagged her tail when getting close to her. That was tearing us apart. My hubby did not think it was fair to Belle to let her go through another night like that, knowing that things are going down and that she'd never get better. And fearing she'd drown struggling to breathe.

I am devastated, I am angry, I am frustrated, I am lonely, and very very sad. I don't think we had any other choice, we could have waited a few days, next weekend in a very optimistic scenario but all leads to the loss of your loved one.

I have only words of gratitude for this amazing community, It helped us a lot through the process. Thank you, thank you & thank you. 

I only hope she visits me in my dream to tell me she is doing well wherever she is.