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Scientific Data regarding Microchip Problems in Small Animals



About Microchips

My Experience

Scientific Data

Alternatives to Microchipping

What is a Microchip?

Microchip Problems Outlined

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Griffonpoint Kennel Stands Against Microchipping

Following is Scientific Data observing problems with Implanting Microchips

If you plan to implant a microchip into your Griffon, be sure that you are aware of the risks.

Don't allow your Veterinarian to persuade you into implanting a microchip into your Griffon. Only implant a microchip if you choose to do so freely.

If you choose to implant your Griffon with a Microchip - it is important to Continue to monitor the microchip implant site over the life of your Griffon and watch for physical changes that may indicate a need for Veterinary Attention.


© Shannon Ford - Updated June 2010

Information on this page courtesy of noble-leon.com

Fibrosarcoma adjacent to the site of microchip implantation in a cat.
Daly MK, Saba CF, Crochik SS, Howerth EW, Kosarek CE, Cornell KK, Roberts RE, Northrup NC.
Comparative Oncology Program, University of Georgia, College of Veterinary Medicine, Athens, GA 30602, USA.
Journal of Feline Medicine & Surgery.
Volume 10, Issue 2, April 2008, Pages 202 205.

Fibrosarcoma with Typical Features of Postinjection Sarcoma at Site of Microchip Implant in a Dog: Histologic and Immunohistochemical Study.
M. Vascellari, E. Melchiotti and F. Mutinelli.
Istituto Zooprofilattico Sperimentale delle Venezie, Histopathology Department, Viale dell'Universita 10, 35020 Legnaro (PD), Italy.
Vet Pathol 43:545-548 (2006).

Fibrosarcomas Associated with Passive Integrated Transponder Implants.
T.E. Palmer, J. Nold, M. Palazzolo and T. Ryan.
Covance Laboratories, Inc., Madison, Wisconsin, 53704.

Foreign-body tumorigenesis: Sarcomas induced in mice by subcutaneously implanted transponders.
Keith A. Johnson.
The Toxicology Research Laboratory, The Dow Chemical Company, Midland MI, 48674.
Vet Pathol 33:5 (1996).

Imaging diagnosis--spinal injury following aberrant microchip implantation.
Hicks DG, Bagley RS.
Washington State University College of Veterinary Medicine, PO Box 647060, Pullman, WA 99164, USA.
Veterinary Radiology and Ultrasound. March-April 2008; 49(2): 152-153.

In vivo reactions in mice and in vitro reactions in feline cells to implantable microchip transponders with different surface materials.
Linder M, DrMedVet[1], Hüther S, DrMedVet[2] and Reinacher M, DrMedVet, DECVP[1].
[1] Institut für Veterinär-Pathologie, Justus-Liebig-Universität Giessen, Frankfurter Strasse 96, 35392 Giessen, Germany.
[2] Schmachtenbergstrasse 20, 45219 Essen, Germany.
The Veterinary Record. 2009; 165: 45-49.

Liposarcoma at the site of an implanted microchip in a dog.
Vascellari M, Mutinelli F, Cossettini R, Altinier E.
Istituto Zooprofilattico Sperimentale delle Venezie, Histopathology Department, Viale dell'Universita 10, 35020 Legnaro (PD), Italy.
Vet J. 2004 Sep;168(2):188-90.
www.ncbi.nlm.nih.gov (Abstract)
www.antichips.com (Full Text)

The Summary of: Liposarcoma at the site of an implanted microchip in a dog (Liposarcoma In Sede Di Applicazione Del Microchip In Un Cane : A.P.I.V. - Associazione Italiana Patologi Veterinari: ATTI del XXI Convegno Nazionale) is available at:

Calcinosis circumscripta in a common marmoset (Callithrix jacchus jacchus).
Wachtman LM[1], Pistorio AL[2], Eliades S[2], Mankowski JL[1]. [1]Department of Comparative Medicine, [2]Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore, Maryland.
Journal of the American Association for Laboratory Animal Science. May 2006; 45(3): 54-57.

Electronic identification with injectable transponders in pig production: results of a field trail on commercial farms and slaughterhouses concerning injectability and retrievability.
Lambooij E, Langeveld NG, Lammers GH, Huiskes JH.
DLO-Institute for Animal Science and Health, branche Zeist, The Netherlands.
Vet Q. Dec 1995; 17(4): 118-123.

Microchip-Associated Leiomyosarcoma In An Egyptian Fruit Bat (Rousettus Aegyptiacus).
Jessica Siegal-Willott, D.V.M., Darryl Heard, B.V.M.S., Ph.D., Dipl. A.C.Z.M., Naime Sliess, M.S., Diane Naydan, B. S., and John Roberts, D.V.M., Dipl. A.C.V.P.
From the Departments of Small Animal Clinical Sciences (Siegal-Willott, Heard) and Infectious Diseases and Pathology (Sliess, Roberts), College of Veterinary Medicine, University of Florida, Gainesville, Florida 32610, USA; and the Pathology Service, Veterinary Medical Teaching Hospital, University of California–Davis, Davis, California 95616, USA (Naydan).
Journal of Zoo and Wildlife Medicine.
Volume 38, Issue 2 (June 2007), pp. 352–356.

Microchip-associated soft tissue sarcoma and massive multiorgan extramedullary hematopoiesis in a house musk shrew (Suncus murinus).
Schutt LK, Turner PV.
Department of Pathobiology, University of Guelph, Guelph, ON, Canada.
www.acvp.org or vet.sagepub.com (See case number 38.)

Microchip-Associated Tumour In A C57/BL Mouse.
GTP Meeting 2000: Case No 15.

Microchip insertion in alpacas.
van der Burgt G, Dowle M.
The Veterinary Record. 2007; 160(6): 204.
veterinaryrecord.bvapublications.com or www.nal.usda.gov (Abstract)

Sensitivity of commercial scanners to microchips of various frequencies implanted in dogs and cats.
Lord LK, Pennell ML, Ingwersen W, Fisher RA.
Department of Veterinary Preventive Medicine, College of Veterinary Medicine, The Ohio State University, Columbus, OH 43210, USA.
Journal of American Veterinary Medical Association. Dec 2008; 233(11): 1729-1735.

Soft tissue sarcomas associated with identification microchip implants in two small zoo animals.
Pessier AP, Stalis IH, Sutherland-Smith M, Spelman LH, Montali, RJ.
Proc Amer Assoc Zoo Vet 1999, Pages 139-140.

Spinal cord injury resulting from incorrect microchip placement in a cat.
Simon Platt BVM&S, Dipl ACVIM (Neurology), Dipl ECVN, MRCVS, Lara Wieczorek DVM, MRCVS, Ruth Dennis MA, VetMB, DVR, Dipl ECVDI, MRCVS and Alberta De Stefani DVM, MRCVS.
Centre for Small Animal Studies, Animal Health Trust, Newmarket, Suffolk CB8 7UU, UK.
Journal of Feline Medicine & Surgery.
Volume 9, Issue 2, April 2007, Pages 157-160.

Subcutaneous microchip-associated tumours in B6C3F1 mice: a retrospective study to attempt to determine their histogenesis.
Le Calvez S, Perron-Lepage MF, Burnett R.
Ecole Nationale Veterinaire, Unite d'Anatomie Pathologique, 44307 Nantes, France.
Exp Toxicol Pathol. 2006 Mar;57(4):255-65.
www.ncbi.nlm.nih.gov (Abstract)
www.antichips.com (Full Text)

Subcutaneous soft tissue tumours at the site of implanted microchips in mice.
Tillmann T, Kamino K, Dasenbrock C, Ernst H, Kohler M, Morawietz G, Campo E, Cardesa A, Tomatis L, Mohr U.
Institute of Experimental Pathology, Hannover Medical School, Germany.
Exp Toxicol Pathol. 1997 Aug;49(3-4):197-200.
www.ncbi.nlm.nih.gov (Abstract)
www.antichips.com (Full Text)

Surgical removal of a microchip from a puppy's spinal canal.
Smith TJ, Fitzpatrick N.
Fitzpatrick Referrals, Halfway Lane, Eashing, Surrey GU7 2QQ, UK.
Vet Comp Orthop Traumatol. 2009; 22(1): 63-5.

Transponder associated neoplasia in damaraland mole-rats (Crytomys damarensis).
Sura R[1], Schwartz DR[1], Goldman BD[2], French RA[3].
[1]Connecticut Veterinary Medical Diagnostic Laboratory, Department of Pathobiology and Veterinary Science, University of Connecticut, Storrs, CT, [2]Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT, [3]New Hampshire Veterinary Diagnostic Laboratory, University of New Hampshire, Durham, NH.
Veterinary Pathology. Sept 2009; 46(5): 1020-1083.
vet.sagepub.com (See case number 85.)

Transponder-induced sarcoma in the heterozygous p53+/- mouse.
Blanchard KT, Barthel C, French JE, Holden HE, Moretz R, Pack FD, Tennant RW, Stoll RE.
Department of Toxicology and Safety Assessment, Boehringer Ingelheim Pharmaceuticals, Ridgefield, Connecticut 06877, USA.
Toxicol Pathol. 1999 Sep-Oct;27(5):519-27.
www.ncbi.nlm.nih.gov (Abstract)
tpx.sagepub.com (Full Text)

Tumors in long-term rat studies associated with microchip animal identification devices.
Elcock LE, Stuart BP, Wahle BS, Hoss HE, Crabb K, Millard DM, Mueller RE, Hastings TF, Lake SG.
Bayer Corporation, Toxicology Department, Stilwell, Kansas 66085, USA.
Exp Toxicol Pathol. 2001 Feb;52(6):483-91.
www.ncbi.nlm.nih.gov (Abstract)
www.antichips.com (Full Text)


Microchip-Induced Tumors in Laboratory Rodents and Dogs: A Review of the Literature 1990-2006.
Katherine Albrecht, Ed.D.


Bull Mastiff develops hemangiosarcoma: One microchip implant located in tumour and another microchip implant located adjacent to tumour.

Blue Ridge Veterinary Associates, Purcellville, VA 20132. July 2009. 
www.noble-leon.com (X-ray)
This X-ray has been generously provided by Howard Gillis (Seamus' dad) in order to increase awareness of the potential microchip-cancer risk.

Warmblood mare experiences neurological damage due to microchip implant.
Laarakker EGA, Willekens C, Kelfkens M, Kokke F.
Den Hoek, Bisschopsweg 2, 3732 HW De Bilt, The Netherlands. June 2005. 
www.invisio.nl (Original Dutch veterinary report)
www.invisio.nl (English translation)

Yorkshire Terrier develops epitheliotropic lymphoma at site of microchip implant.
McGee ED.
Antec Diagnostics, Southhaven, MS 38671. December 2009.
www.noble-leon.com (Biopsy Report)
This medical report has been graciously provided by Linda Hawkins (Scotty's mom) for the website of www.noble-leon.com in order to increase awareness of the potential microchip-cancer risk.





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