So my dog is a German Shepherd / Husky mix. Two weeks ago she would squeal when she jumped on couch or just sitting down , it then got to were one night she would just sit there panting and getting up then squealing. I took her to get her claws trimmed thinking maybe that was causing her pain. It seemed to work , she didnt squeal as much only when she was moving around a lot (I thought maybe her paws were sore or something) ,but then a couple of days ago ,at 4 AM ,I heard screeching at the top of her lungs I ran out and saw her pacing and screeching , she was limping , I took her to vet ,at first I thought her back legs were hurt so we got xrays .Everything looked fine.Vet gave her meds for arthritis(that didn't help at all). But as soon as she got home it started again , everytime she stood up and walked she screeched ,i had to sit the entire rest of the day with her like that she wouldnt sleep at all just whined ,got up screeched,then I noticed her front left leg was shaking and she started limping on that leg.I went to a another vet the next day , they felt her entire paw and she didnt react at all , now she is on some pain killers , they said she may need an xray if pain doesnt go away. I'm really confused on how her pain will be absolutely horrible and then disappear for a while were she can walk and then come back, they said may be false pregnancy but don't know how that could cause her to limp. Now she is resting a lot she still squeals somewhat and when she goes up stairs she tries not to put pressure on front paws. Does anyone know what this might be?