Tia very suddenly was holding her front paw up a few weeks ago, we took her to the vets and she had to be sedated to have a blackthorn removed which was wedged in her nail bed.
It came on very suddenly, but she had obviously picked it up a couple of days before.
I take it you have examined his leg & paw, you would know if it was painful by the way he would respond.
Hope it's nothing serious
