[Deviruchi]

i'm not sure if i'm paranoid.. but while i was in the kitchen.. i saw my puppy started to shake for no reason.. like as if he was scared.. he was tied down with a leash to the crate.. he had the leash stretched since he wanted to see what i was doing.. but i noticed that he was trembling/shaking. there was nothing that should have scared him so i'm not sure why he might have been like that..

i went over and held him asking him what's wrong and such and he shaked a bit and calmed down and fell asleep on me.

anybody know what this could be? or am i really just paranoid lol
i just never seen him do this before unless i know something scared him for sure.. (like crazy kids running around) so i'm not sure.. i'm not sure if the leash ended up being too tight or from something he ate.. i gave him some apples earlier but im sure its not that..