I picked up a two week old pup at the side of the road about 5 weeks ago. We bottle fed him puppy formula, and he developed normally, his started seeing, his ears opened, his teeth came out and are perfectly healthy, he started playing and moving around, all at the right time. We started feeding him puppy pellets softened with boiling water at about 4-5 weeks old, as the vet proposed. He was growing up healthy and happy, up until about 4 days ago. He started wimpering (at first) while falling asleep, but it is much worse now. Whenever he lies down to sleep he starts whining and having small spasms, and at some point he starts yelping and crying out (it sounds as if he is in pain). He becomes quiet after about 15minutes, and then after a while everything starts over again, until he finally falls asleep. When he is awake, he eats enough and drinks enough water. He plays and growls and runs. I touch him everywhere, thoroughly, to check if there is pain somewhere, but it doesn't seem to hurt anywhere when he is awake. When he wakes up, he is disorientated, and cannot walk properly. His front legs cave in. When he wakes up completely, he walks and runs, but he is very uncoordinated and wobbly.
When I first found him he had an abscess on his neck, when the vet pulled of the scab a very large amount of pus came out. The abscess started healing, but another one formed close to the first, which the vet drained. Another one formed on his upper neck, and we drained this one as well, and the vet decided to put him on mild antibiotics. All of the abscesses have healed completely (about 8 days ago).
I believe that my puppy was born in a location, in filthy conditions, and someone left him at the side of the road.
He has a domed shaped head, which the vet at first explained as something that chiuaua's are born with, and that he maybe had some chiuaua in him. He is a tiny breed dog, looks a bit like a jack russel.
We have been to the vet, he got his shots and his second dose of deworming medication. The vet says that the whining etc could possibly be because of the worms. Otherwise it could be something like hydrocephalus, which we will test for if the deworming does not work. I would really, really like some advice from people with similar stories. I am so worried, and sad, as my baby seems very uncomfortable.