Basically, fluid buildup in the lungs is caused by failure of the left
side of the heart. When the left side of the heart is not pumping
adequately, there is in increase in pressure in the *** vessels before
it...in the lungs. This increased pressure causes fluid to exit the
*** vessels and enter the lung tissue. This is called pulmonary edema.
In situations where pulmonary edema is caused by cardiac problems, the
condition is termed congestive heart failure. Failure of the right side
of the heart (which often occurs simultaneously) causes increased
pressure in the vessels coming from the rest of circulation and often
manifests itself in increased abdominal fluid and liver changes.
It's impossible to say whether the fluid detectable when the first vet
say your dog. It is very possible that heart failure had not progressed
to the point where the fluid was readily evident.
Scott Weese DVM, DVSc, DipACVIM
> Today our 9.5 year old basset hound "Buddy" suffered a major heart failure due
> to fluid in his lungs. The Emergency room vet didn't answer my questions
> about how fluid built up in his lungs. Buddy had a heart murmur and has had one
> all his life. On Friday we took him to our vet for a check up, because he had
> lost his appetite and was losing weight. Today he began having a hard time
> breathing and by the time I got him to the vet he was almost passed out. The
> vet said that he was having a hard time breathing even with Oxygen. So I am
> trying to find out did the vet miss fluid in the lungs on Friday or could fluid
> build up in 48 hours enough to push him over the edge.
> Thanks for your assistance