Rearing a baby Guinea Pig

Question
I recently acquired a baby pig. The original owner brought it into my clinic Thursday, 11/19. She had told us that her little girl had dropped the pig shortly after it was born. I am not sure (the Owner was not helpful) how long the baby was with out its mother. It presented with an extreme head tilt, seemingly unable to use it's back legs. The O just wanted to put it to sleep. As we were waiting, I syringed the pig some water, and it suckled. So...I gave it the day, starting to feed it formula. By the end of the day, it was able to sit up, taking a few steps. NOW its been 4 days, the pig still has a slight head tilt but other than that is doing GREAT. It gets around well, however still falls over on occasion, unable to correct itself. SO, the few questions I have are; 1. I have been feeding it puppy formula, is this ok? The pig is about 4 days old, 2. When should I start offering adult food? 3. Are there any issues that could come up with an pup not transitioning well into adult food? (Because of it being alone) 4. When should I be concerned about supplementing vitamin C? And lastly, just last night, while I was feeding it, the pig started to sneeze, then I saw milk bubbles come out of its nose, 5. What is happening with that? Am I feeding to fast?
Thankyou so much for your help.
Heather Krueger

Answer
Hello Heather!
Head tilt (wry neck, torticollis). This is usually due to internal ear infection, sometimes secondary to a respiratory infection. The cavy usually tilts her head to one side and has a loss of balance, often falling when trying to walk. Strep bacteria are a common cause. Treatment is with antibiotics.
Try looking up recipes for pellet mash, I have posted one a few times, so its on this site. Also try picking up some emergency syringe food from the vets.
The bubbles are exactly that, feeding it too fast. Go about .1 of a ml, wait 3 seconds and do another .1.
There should be a little trouble but hopefully not much in the transition from wet to solid, but try with a bit of pellets chopped in half in the first few days. Consult a vet if there is any suspected anorexia or inability to eat.
I am so glad that you took it upon yourself to nurse this little one back to health! Your a good person.