She might be giving the shots all over again bc his 1st vaccination was given at 6 weeks of age...too young.
Make sure on his next visit, have the 3rd round of shots & do the rabies a few weeks later. Adverse reactions can occur in some dogs if given together.
You shouldn't take him outside or interact w/other dogs until he's had all his vaccinations.
Here's a good link from the YT library:
http://www.yorkietalk.com/forums/yor...-overview.html