I found the tactical vest they use on those Navy Seal Team 6 dogs

Anything that says, "call for price" can't be cheap, but wow, look at that puppy!  The features include:

Integrated Camera Vest
Ensures Camera Stability & Rapid Deployment

Waterproof
Enables Amphibious Assaults

Simple
Gross Motor Skills Activation

Effective
Designed for Maximum Barrier Penetration

Lightweight
Entire Intruder Communication System Weighs 20 oz.

Most importantly, I believe it is made of Kevlar, so it is bullet and knife resistant.  You can find more info about it here.