Jennifer Messer is a veterinarian working in a small animal practice in Waterdown Ontario. In addition to routine clinical medicine, Jennifer conducts private canine behaviour consultations and has implemented an in-clinic puppy parenting program to educate dog-owning clients about puppy behaviour and training.

Jennifer completed a Bachelor's Degree in Psychology at McGill University, where she graduated with first class honours in 1993. She then went on to study Veterinary Medicine at the Ontario Veterinary College in Guelph, Ontario, and graduated with a DVM in 2001. During her years as a veterinary student Jennifer established and operated Montessaurus Puppy School in Guelph. Jennifer has given numerous lectures and workshops to veterinarians, dog trainers, veterinary students, and the general public on a variety of canine behaviour topics, including aggression and early training and socialization. She has also written on canine behaviour for Chatelaine magazine and has been featured on Discovery Channel.

Jennifer is owned by her Staffordshire Bull Terrier "Monte", and her Pit Bull Terrier "Charlotte", who live with her in Southwestern Ontario.