"Leg Jerk" reaction more frequent...

[MadisonsMom]

I have a beagle (3 years old) and within the last few days he has been scratching more then usual and when scratched/rubbed on his back he gets the leg going....I know that this behavior is often normal (somthing along the lines of or knee jerk reaction at the doctor) but he seems especially sensitive as I can barely rub his back without the leg going crazy! I do not see any thing on his skin nor do I see any fleas/bugs etc. I also have another dog in the house and she is fine (no scratching as I would assume she would with fleas). Should I worry about him being so sensitive all of the sudden or is it weather, allergies, etc??


Thank you in advance for your help!