Welcome to Justanswer! I am Dr. Altman and happy to assist you both today!
I am so sorry that your little one was bitten but is now still painful!
It sounds like he is having an issue with his neck. When there is an impingement in the neck vertebrae these are the very symptoms a dog will show. I have a little dog that does this occasionally as well. If the impingement is more on one side of the neck than the other then the pressure will increase and cause discomfort in the leg but also cause them to tilt their head in a certain way in order to provide relief from the pressure. CLICK HERE for more information on this condition
Ideal is to have your veterinarian re-evaluate your dog to definitively diagnose the problem and start on additional pain medication to control the discomfort. Until you are able to do this please restrict activity (which often they are already doing themselves but that means no steps/ stairs and only carrying to go potty) and rotating warm and cool compresses on the neck in ten minute intervals to reduce pain and increase blood flow.
You can also do light circular massage up and down the neck to stimulate blood flow if this is not too painful and will allow it.
To pick your dog up please use one hand between front legs and then scooping behind back legs to avoid pressure in the middle of the shoulders. I have actually trained my little dogs to put their front legs on my forearm to minimize pressure on their backs and the associated discomfort.
Please let me know if you have any additional questions I can assist with. I hope you are able to get your little one comfortable soon, truly.
If you have more questions or if I can help in any other way, please do not hesitate to ask! If you would like to accept my answer, please press RATE OUR CONVERSATION at the top of your screen (I am not compensated in any other way). Bonuses are always welcome. Thanks!