Should I buy a 3-week-old puppy diagnosed with pneumonia? What to do?

Yes, it is quite possible the pneumonia has not resolved. She needs urgent reassessment by a vet and further medication, possibly intravenous fluids and antibiotics in order to stabilise her condition. Such severe pneumonia in a young pup is very concerning and can be fatal due to lung scarring and collapse. It is possible there may be underlying birth defects contributing to the original condition and/or her poor response to treatment

I would not recommend purchasing such a puppy prior to repair and full recovery. I would be concerned not only about surgical repair and recovery but where one external birth defect is present, additional internal defects are often detected as a pup matures also

He may have Splay puppy syndrome, sometimes called Swimming Puppy Syndrome. If you really want to buy this puppy, I would have it examined by a veterinarian before buying it making sure it it is healthy. If the breeder does not want you to have it examined by a vet of YOUR choice, then I would say: hands off. If the puppy has health issues, I would not buy it either. There are many healthy puppies out there to buy.

If she is eating well/nursing well, and going to the bathroom normally in addition to acting fine, she may be OK. I just worry about how young she is though. I wouldn't let this go on too long. If she were to get sick it's much harder on her because her immune system is so immature. I would take her in when you can to see the vet. They can check her lungs and make sure the congestion is just in her upper respiratory tract. Tiny puppies can also have a condition cause cleft palate, for example, and that can cause them to inhale the milk when nursing. This can cause pneumonia, so again, I'd have her examined as soon as you're able. In the meantime, taking her in the bathroom when members of the household shower can help clear out her upper respiratory react, acting like a humidifier with babies that have stuffy noses.

No, it would not be a good idea to put him in the water until he is much older. Since they are not good swimmers at that age is it very easy for them to choke on water. That water can get in the lungs and can also cause pneumonia. His lungs are already compromised from his last bout of pneumonia. Salt water is especially bad. It is best to wait until he is an adult to put him in the water.

I am concerned that she is having such trouble breathing. This could be another pneumonia, an upper respiratory infection, a fungal infection, a congenital heart problem and much more. If your vet has already done X-rays and they were normal, you may want to talk to them about having an ultrasound of the heart done. Also, I would have her blood work checked to see how her liver and kidney values are and see what her white blood count looks like. Finally, I would talk to your vet about whether see needs some antibiotics and medicine to help her breathing. I hope this helps and she starts to feel better soon.

If your pup is having a lot of trouble breathing and you are concerned he is in respiratory distress, then I would have him seen by a vet as soon as possible. It's always fine to have your dog checked out by a vet if you are very concerned. Otherwise, I'd wait the three days and see if he improves before taking him back into the vet. I hope he feels better soon!