my 7 weeks old staffie had his vaccinations (KC, Flea along with the booster) on friday, since then i've noticed a change in his behaviour and also he's not eating as he normally odes. is this cause for concern?? 

I didn't think they did jabs until 8 weeks ??

apologies typo, he's 8 weeks.

Sorry that wasn't meant to sound rude i just thought something had changed i never knew about :D. In my experience puppies do go off food and are not quite themselves after they have their jabs although this doesn't usually last for long and they are back to their annoying little ways ;)