Welcome to Justanswer! I am Dr. Altman and happy to assist you both tonight! I am online for a few hours so hopefully you will be able to respond before I exit.
If your 16 year old dog is showing signs of pain and refusing a treat such as pizza I would advise a veterinary exam tomorrow if possible. Being a Daschund as you know they have a propensity for injuring their back and if this is the case getting her on appropriate pain medication is key in hopefully helping her feel better and eating again. Especially at her senior age...
Until you are able to get her in 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 back and tail in ten minute intervals to reduce pain and increase blood flow.
You can also do light circular massage up and down the back and tail 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 back. 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 (I am not compensated in any other way). Bonuses are always welcome. Thanks!
If you have additional questions after you rate the question, you are welcome to request me for additional conversations if I am on-line or by beginning your question "Dr. Altman..." or "Dogdoc4u..." and others will leave the questions for me. Good luck to you both!!!