Im not a doctor,haha but i think it might be either; chicken pox,herpes, or u just have a lot of bug bites.lol. hope this helped a little.=)
Go get a lotion at the drug store and then call your doctor. It could be an allergy or something else.
chicken pox
It is possible to be a STD or it could be numerous other diseases. You will need to be checked out by a doctor.
I have a Shih Tzu too and she gets "bumps" all over her. Those bumps are toomers. It is ok though because she/he wont die from it so don't worry.