my pupy

Question
my puppy is 4 months old and sometimes his leg shakes a little bit does that mean it has cancer in it

Answer
No, I seriously doubt that your puppy has cancer in his leg.

Usually a puppy's leg shakes because of its structure, and it has to do with the dog's static balance versus its kinetic balance. http://www.ecsca.org/morebal.html They often outgrow this as they get older.

Karen