PetLife Pharmaceuticals Continues Execution of its Vitalzul TM Business Plan with start of Proof of Concept studies; Provides Updates Hancock, MD, Sept. 14, 2016 (GLOBE NEWSWIRE) -- Hancock, MD - PetLife Pharmaceuticals, Inc. (OTC QB: PTLFD) (the "Company"), a developer of Vitalzul™, a new generation of high potency veterinary...