I can give you some basic guidelines for your little one but it is difficult to hone in on the cause of her symptoms without additional information
If she is not walking hunched, hesitation with movements then beginning a few things
-Pepcid 1/8 tablet 10 mg (famotidine) every 12 hours
-White rice and boiled lean meat for meals which is bland yet bulking to her stomach x 2-3 days in small more frequent meals
-Increase leash walks to increase digestion, reduce nausea and cramping, so at least 15 minutes two to three times daily for now
-If there is no change in her energy, she is refusing food and water, and has any signs of vomiting or diarrhea then please have her evaluated by your veterinarian
If she is walking hunched or showing stiffness/ soreness:
Ideal is to have your veterinarian evaluate your dog to definitively diagnose the problem and start on appropriate 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 back in ten minute intervals to reduce pain and increase blood flow.
You can also do light circular massage up and down the back 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.
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