I have a 2 month-old puppy. Last night I gave her a piece of a beef strip and when she will eat her dinner, she poop and then she suddenly walked with her back arched. This morning he pooped water, and walked again like that. Once in a while she returns her walking in her normal way but also once in a while she walks again with her back arched. I asks a vet on what medicine should I give to my puppy and gave me a Colimoxyn. I gave it to my puppy when I got home. And now I'm expecting that she will be fine, but then she walks like that. I think she's suffering more now. I don't see any weakness to her, she eats and drinks well. I think the only problem is the pain she feels and that's why she lift her tummy. I dont know what to do.