The dog is old, a lab/pit mutt and had a hard time walking last night, her hind legs kept giving out, and a couple of times they just completely gave out. She also essentially stood up and tipped over at one point so I thought we are close. I went to bed thinking today I would put her down depending on how she did overnight. We woke up this morning, she went outside and did her "thang" drank some water and all seemed well.
That happened to our beloved dog that was also lab/pit mix. She had the same symptoms as your dog. It was cancer. She had an operation, but the cancer had metastasized to other organs. The operation bought us a couple of months that we used to pamper her in every way possible and it allowed us time to say our goodbyes.
I hope your dog fares well. I know it really impacts the children when their childhood pets die.