Ozzy came to us at 11 weeks, unvaccinated (the breeder said that it wasn't necessary before 15 weeks because he still had his Mum's immunity) Needless to say we had his jabs started a week after we brought him home (on the advice of the vet who said it was always better to wait a week after getting them home, as if they developed an illness it was difficult to know whether they had brought it with them from the breeder, or if it was something to do with the jab). His second jab was 3 weeks later, at 15 weeks, on a Monday, and the vet said we could take him out 'at the end of the week'. We took him for his first walk on the Friday. On the Sunday he developed colitis and we took him to our vets practice who are open 7 days a week, and saw a different vet. He said that as he'd only had his jab a week ago we should still have been carrying him and not let him walk! So, it just goes to show that even vets in the same practice have different views on how long after the second jab they should be allowed out. However, we did wonder if the colitis was caused by him being allowed out too soon, but we'll never know!!