Dr. Peter Walsh is a 1994 graduate of Colorado State University’s School of Veterinary Medicine. He also has a Masters in Veterinary Science. Dr. Walsh joined the faculty at the University of California Davis where he rotated coverage for all three of the small animal surgical services, and was ultimately instrumental in developing and running the small animal surgical oncology service. Dr. Walsh is board certified with the American College of Veterinary Surgeons, and has a particular interest in surgical oncology and reconstructive surgery. He is considered one of the leading authorities on limb spare procedures in dogs with bone tumors.
In the novel by Pam Houston, the character of Dr. Evans is based on the real Dr. Peter Walsh. The story may be fiction, but when Dr. Evans crawls into a crate to spend the night with a patient, it is truth. Simply one of the best out there, as a doctor, surgeon, and human being.
Celia Valverde, DVM, DACVS
Board-Certified Veterinary Surgeon
Dr. Valverde completed her Small Animal Surgery residency at the University of California Davis School of Veterinary Medicine in 2001 and became a Diplomate of the Academy of Veterinary Surgeons in 2003. During her 3-year small animal surgical residency at UC Davis, Dr. Valverde had extensive training in soft tissue, neurosurgical, orthopedic, oncological procedures and minimally invasive surgery. Dr. Valverde returned in 2010 to UC Davis to complete the Don Low fellowship in small animal anesthesia and pain management.
Dr. Valverde graduated from Veterinary School in Sao Paulo, Brazil. After relocating to Alaska in 1986 she was one of the veterinarian responders working with seabirds and the Bald Eagle recovery program during the Exxon-Valdez oil spill. She has also been a veterinary volunteer with the Alaska Iditarod Dog Sled Race.
Dr. Valverde enjoys all aspects of teaching and was on the Faculty at UC Davis in various positions from 1990 to 2013. She has taught briefly in several Veterinary Schools including Onderstopoor in South Africa, University of Washington and Kansas State. She also has given lectures in the USA, South Africa, Brazil, Guatemala and Honduras.
Dr. Valverde is committed to providing less invasive surgical options, exceptional pain management, and compassionate care to all her patients.
While not practicing medicine, Dr. Valverde belongs to a rowing team, enjoys ice climbing, fly fishing, cycling, kayaking, bird watching, cooking and gardening.
Erica Queen, DVM, DACVIM
Owner, Internal Medicine Specialist
The U.C. Davis School of Veterinary Medicine is regarded as one of the top three veterinary schools in the world. As a graduate of this distinguished university Dr. Queen was honored as a resident by faculty for her clinical and teaching contributions in 2009. She also received the Small Animal Resident award from the senior students for her contributions to their education in clinical rotation in 2010. Her knowledge and expertise in Small Animal Internal Medicine are equaled only by her generosity to and compassion for all things big and small. Dr. Queen has now opened her own specialty/emergency practice to serve as the specialty arm to all the wonderful veterinary hospitals in the area and to the clients and dogs or cats she currently cares for, along with the ones she has not yet met.
Jan S. Suchodolski , Mary L. Foster, Muhammad U. Sohail, Christian Leutenegger, Erica V. Queen, Jörg M. Steiner, Stanley L. Marks. The Fecal Microbiome in Cats with Diarrhea. Published: May 19, 2015 DOI: 10.1371/journal.pone.0127378
Johnson, LR, Queen, E, Vernau, W, Sykes, JE, Byrne, B; Microbiologic and cytologic assessment of bronchoalveolar lavage fluid from dogs with lower respiratory tract infection: 105 cases (2001-2011). Journal of Veterinary Internal Medicine.
Queen, EV, Marks, L, Farver, TB. Prevalence of selected bacterial and parastic agents in feces from diarrheic and healthy control cats from Northern California. Journal of Veterinary Internal Medicine. 26 (2012): 54-60.
Queen, EV, Vaughan, MA, Johnson, LR. Brochnoscopic debulking of tracheal carcinoma in 3 cats using a wire snare. Journal of Veterinary Internal Medicine. 24 (2010): 990-993.
Foley, JE, Queen, E, Sacks, B, Foley, P; GIS-facilitated spatial epidemiology of tick-borne diseases in coyotes (Canis latrans) in northern and coastal California. Comparative Immunology, Microbiology & Infectious Diseases. 28 (2005): 197-212.
Center for Comparative Medicine- NIH Summer Research Fellow, 2003: Cytokine Profiling of Northern California Rodent Species.
UC Davis Department of Nutrition: Adipocyte culture to investigate metabolism and hormone production; research relevant to obesity and diabetes mellitus.
American Veterinary Medical Association, 2002-present
California Veterinary Medical Association, 2002-present
American Association of Feline Practitioners, 2004-2006
Lori Siemens, DVM, DACVIM
Dr. Lori Siemens graduated from the UC Davis School of Veterinary Medicine in 1992. After an internship in small animal medicine at Michigan State University, Dr. Siemens went back to UC Davis for her cardiology residency and became a board-certified cardiologist in 1996. She started the first mobile cardiology service in the Sacramento area in 2007. She is 100% dedicated to helping every cardiology patient achieve the highest quality of life possible while being treated for their heart disease. Appointments are scheduled for one hour to ensure not only a thorough exam and history, but to also give personal attention to the clients and patients she will come to care for as they all move along this journey together.
Marilyn Koski, DVM, CVA, CCRT
Acupuncture & Rehabilitation Specialist
Dr. Marilyn Koski is a graduate of the UC Davis School of Veterinary Medicine and is certified in the specialties of Veterinary Acupuncture and Canine Physical Rehabilitation. She has been a faculty veterinarian at the Veterinary Medical Teaching Hospital at the UC Davis School of Veterinary Medicine for over 15 years, and in private practice for 23 years.
Dr. Koski's primary focus is to provide pain management and rehabilitation services to dogs, cats and exotic animals, and to educate students, clients and colleagues in the value of integrative medicine therapies. Dr. Koski is involved in clinical research focusing on the use of low level laser therapy to relieve pain and promote tissue healing. She has also worked with exotic animal species in zoos and aquaria in California, Hong Kong, Australia and Thailand, and she has worked with wildlife species in California and the Antarctic.
In her free time, Dr. Koski enjoys hiking, gardening, art projects, and cooking for friends and family. She shares her life with her husband of 32 years and a varied family of furred, feathered and scaled "kids.”
Deb Morey, DVM, DACVECC
Emergency & Critical Care Specialist
Debbie Morey, an emergency and critical care specialist, obtained her DVM from UC Davis in 1992. After graduation, she completed a year-long internship in small animal medicine and surgery at the Sacramento Animal Medical Group. Debbie then moved to Fresno for a year of intensive emergency and critical care experience at the Veterinary Emergency Service before returning to Sacramento to head up the emergency department at the Sacramento Animal Medical Group for the next four years. In 1998 Dr. Morey embarked on a residency training program in Emergency Medicine and Critical Care while also working at several busy emergency practices and raising two children. In 2005, she successfully passed the rigorous examination to become a Diplomate of the American College of Veterinary Emergency and Critical Care. Debbie’s professional interests include shock resuscitation, critical care monitoring, nutrition, wound management, and training veterinarians and technicians in critical care techniques. When off duty, she enjoys spending time with her 2 boys, 2 dogs, and 5 cats. She also enjoys downhill skiing, running, hiking, and wine-tasting.
Casey Kohen, DVM, DACVECC
Emergency & Critical Care Specialist
Dr. Casey Kohen is a Northern California native, who received a BA in psychology from UC Santa Barbara in 2003. He spent several more years in Santa Barbara after college, working in a 24 hour veterinary emergency and specialty hospital much like MarQueen Pet Emergency and Specialty Group.
Dr. Kohen graduated from UC Davis Veterinary School in 2012, finishing at the top of his class and was awarded the UC Davis School of Veterinary School Medal for academic honors. He completed a small animal rotating internship at North Carolina State University where he earned the Outstanding Intern Award.
Dr. Kohen returned to UC Davis in 2013 and completed a small animal emergency and critical care residency, and became board certified by the American College of Veterinary Emergency and Critical Care in 2016.
Following his residency, Dr. Kohen joined the UC Davis Small Animal Emergency and Critical Care Service as an Associate Veterinarian where he trained veterinary students as well as emergency interns and residents. He has also been with MarQueen 24 hour veterinary hospital and specialty group since 2015 as one of MarQueen’s board certified critical-care and emergency specialists.
Dr. Kohen has spoken at veterinary continuing education events both in Northern California and nationally and enjoys helping his colleagues in veterinary emergency hospitals as well as general practice. MarQueen is open 24 hours a day for veterinary referral hospitals and Dr. Kohen is one of our specialist on call to assist our emergency doctors as needed. He is also available most days to help our referral veterinarians with any question or potential emergency transfers.
Dr. Kohen’s professional interests include fluid therapy, respiratory emergencies, point-of-care ultrasonography, and cardiopulmonary resuscitation. Dr. Kohen also is passionate about providing exceptional patient care to critically ill and injured patients and has strong interests in supporting emergency veterinarians and technicians to achieve those goals.
Brian MacKie DVM, DACVIM
Brian MacKie DVM, DACVIM-Cardiology has been diagnosing and treating dogs and cats at MarQueen Pet Emergency and Specialty Group in Roseville since our doors opened. He is a veterinary cardiologist in the Sacramento area and is available for consult appointments as well as on an emergency basis through our Emergency Service.
Dr. MacKie obtained his degrees in Animal Sciences and Veterinary Medicine from Washington State University (Go Cougs!) prior to his rotating veterinary internship here in Sacramento. It was during this time Dr. MacKie and his family fell in love with the area. After his internship Brian was accepted and completed his cardiology residency and board certification at the University of Wisconsin-Madison. It was there that Dr. MacKie implemented the use of the Amplatz Caninie Ductal Occluder a non-invasive procedure to treat congenital heart disease. He has also published research papers on implantable monitors for fainting in dogs and pulmonary hypertension as well as give continuing education lectures.
After successfully completing his residency and board certification in Wisconsin Dr. MacKie returned back to the Sacramento area to practice his love of veterinary cardiology. He is highly recognized doctor and human being in both northern and central California and we are proud to have him as part of MarQueen Pet Emergency and Specialty Group.
Erica Moore, DVM, DACVIM
Our veterinary oncologist Dr. Erica Moore earned her undergraduate and veterinary degree from the University of Tennessee in her hometown of Knoxville. After graduating Dr. Moore completed a rotating internship at a private practice in Southern California and a one-year clinical research position at the University of Pennsylvania in Philadelphia. Dr. Moore recently completed her residency at the prestigious U.C. Davis School of Veterinary Medicine Teaching Hospital. Earlier this year she passed all boards required to be recognized as a board-certified veterinary oncologist and is excited to be joining the MarQueen Veterinary Emergency and Specialty Group.
Dr. Moore has a passion for treating animals with cancer which stems from her own personal experiences. Prior to veterinary school her beloved Golden Retriever, Nala, was diagnosed with cancer. After the devastating news, she and her family chose to focus their treatment efforts on quality of life - they spoiled her beyond belief! As Dr. Moore reflects back to every tail wag and each delicious treat, it was Nala who helped her to understand that the goal in veterinary cancer treatment was to make sure dogs and cats never know they are sick so that they may keep doing all the things they love most. On her journey, Dr. Moore has had the privilege of meeting so many special dogs and cats, along with their doting parents who have captured her heart and reinforced why she loves what she does every single day!
While there are always many avenues of treatment, her goal is to find the best option for each and every one of her patients that will not only treat their cancer, but also allow them to keep living their life happy, in the moment, and to the fullest!
Ann Della Maggiore, DVM, DACVIM
Dr. Ann Della Maggiore is a board-certified veterinary internal medicine specialist. Dr. Della Maggiore has spent the last five years (2012-2017) working as a faculty internal medicine specialist at UC Davis - recognized by QS World University Rankings as the best veterinary school in the world in 2015 and 2016. Dr. Della Maggiore has taught numerous veterinarians and is recognized by veterinary medical students and her colleagues as an exceptional specialist. Dr. Della Maggiore was recognized as both a favorite resident and favorite faculty member by previous graduating classes during her time at UC Davis.
Dr. Della Maggiore completing her undergraduate training in 2003 at California Polytechnic State University in San Luis Obispo in Animal Science and then earned her veterinary degree from University of California, Davis in 2008. She went on to complete a veterinary internship program in small animal medicine and surgery at a 24-hour pet emergency and specialty practice in Ventura, California. Dr. Della Maggiore then completed her small animal internal medicine residency at UC Davis, and became ACVIM board certified in internal medicine. She was quickly offered and accepted a position to practice veterinary internal medicine as an Assistant Professor of Clinical Internal Medicine at the UC Davis Veterinary Teaching Hospital, lending her professional internal medicine expertise to clinical teaching and service.
Dr. Della Maggiore has joined MarQueen Veterinary Emergency and Specialty Group and looks forward to working with Dr. Erica Queen in conjunction with the referring veterinarians of the greater Sacramento and outlying foothills such as Roseville, Folsom, El Dorado Hills and Grass Valley to provide high quality internal medicine services to their patients and clients.
Her veterinary medical interests include, but are not limited to small animal endocrinology, infectious and immune-mediated disease, as well as minimally invasive diagnostic and therapeutic procedures. Dr. Della Maggiore has lectured both internationally and nationally in the area of canine and feline internal medicine, specifically endocrinology. Dr. Della Maggiore has written several book chapters and journal articles.