Could you elaborate on the statement in this article, "It is not generally considered practical or ethical for a pet to receive oxygen therapy at home."?

The Emergency Vet found that my 11 year old, 88 lb Black Lab/Rot mix has fluid in the lungs. He was given Cipofloxzin 500mg (2 tblts / 12 hrs) and Furosemide 50mg (3 tblts/8hrs). I read that oxygen is good for dogs lungs, my question is, how long should he be given the oxygen at a setting, how often in a day, and not to exceed how many days.

For my own curiosity, Our 9 yr old pet dog was being treated for lung tumors. Two days later she started having difficulty breathing, she could breath sitting or standing but trouble while lying down. We took her to the emergency clinic at 5:00pm. They put her on oxygen because her reading was 85. They recommended that she be left overnight and they would regulate her medication and give her back to us in the morning. She colasped while going potty on oxygen at 10:30pm . They said she had a heart attack. The oncologist said she was a good candidate because she was in good condition except tumors in the lungs. The question: Can to much oxygen cause a dog to have a heart attack From the research I have done so far my conclusion is that it can and other issues with other organs am I correct?

I feel that there was a lack of understanding about the condition of my dog and an incompetent/negligent doctor. My little guy was an 11 year old, 6.5 pound Chihuahua. In the prior 4 months he had to be put on .625mg Vetmedin and 1.25mg Enalapril every 12 hours for a heart murmur. In the afternoon he started to have trouble breathing. When it persisted, I rushed him the a vet(not my normal vet as they were closed) where we arrived at 1:45 pm. He was obviously running high on adrenaline, eyes wide open, as he was struggling to breathe. They took him back immediately and started oxygen therapy in a clear plastic box. Once the doctor checked him out and came in to discuss the cost for treatment ($800), he asked me if there was any history of him having trouble breathing? I asked the doctor if he read the questionnaire I filled out as I detailed that and that he is on heart murmur medication and he has had some problem couching here and there they think is related. But nothing major until today. He said he did not read it and that is what he would have diagnosed(heart murmur/congestive heart failure). He said he needed an xray of his lungs,CBC, and blood chemistry tests and to give him .15ml of Midazolam to calm him down and .3ml of Furosemide to drain his lungs. The doctor told me I could come back in 3 hours at 4:45 to pick him up and take him home and everything should be fine. The receptionist called me an hour later and said that the doctor felt he probably needed to be monitored overnight. But they close at 5 and the overnight vet opens at 5:30 so I had to pick him up and bring him to the other vet and he would be without care for 30 minutes or so. They said the doctor that was working on him now will be the doctor at the overnight vet too. I asked them what the test results were and why the change to have him monitored overnight. I asked was there something wrong. They said nothing major, they just felt he should be monitored overnight to be safe and the doctor will call me in a 2.5 to 3 hours to update me on the test results, but nothing to worry about. So I picked him up and he seemed a little more alert when he first saw me and struggling to breathe a little less as his eyes were not wide open like when I dropped him off. But within a few minutes he was really fatigued looking, less alert looking and he was still struggling to breathe, but not with the same vigor as as few hours ago trying to breathe almost like he was too drugged up. I feel that this is primarily because they gave him Midazolam and they should not have. There was no reason to "relax" him with basically Valium. I feel when he was in the oxygen chamber, that helped relax him and breathe and thus his adrenaline was not running so high. Combine that with the Madazolam and he was too mellowed out. Then when you take him out of the oxygen, his adrenaline was not running high and he probably needed that to fight to get the amount of air he needed. It seemed he was too groggy to fight for air. Within 3-5 minutes he died in my arms. I was able to give him mouth to mouth to revive him until we got to the overnight ER, but there was no doctor there and the receptionist that I gave him to said there was nothing she could do and he did not make it. I finally found out a few hours later that his test results were of a Bronchial/alveolar pattern, VHS=12.5 R side of chest was completely congested with fluid/edema. Cardio- cardiac murmur, systolic. Oral cavity - MM -pink to greyish pink. , heavy calculus, bloody sputum. Respiratory - Tachypena, crackles, dyspnea. The doctor thought it was not a big deal and he was going to be fine. Would any competent doctor discharge a small dog in this condition with no medical supervision for a minimum of 30 minutes? Why would the doctor that was going to the other location not take him and make sure he would be fine or at least express the severity of the situation to me? Why did they not have someone ready to receive a critical dog? Do you agree that the Midazolam was probably the reason he was so groggy and not able to catch his breath with deep breaths and a contributor to his passing? I really feel that the lack of oxygen (since he was too drugged up to fight for breath) is why he basically passed out and died in my arms slowly from the time they took him out of the oxygen tank. Also, as I held him in my arms he was spitting out what seemed to be blood as he coughed before he passed. I appreciate your feedback on how his care was handled. I think the doctor was incompetent to negligent.