The sudden pain in the dog's front legs that makes it scream may be caused by trauma, calcium deficiency, cramps, or joint disease. First, check whether there are punctures or scratches on the dog's paws. If there is trauma, It is necessary to clean the dog's wounds in time; if there is no external injury, it is best to take the dog to the pet hospital for examination, and then carry out targeted treatment after confirming the cause of the disease to avoid delaying the condition.