Tumor Frequency in Homeless Dogs Small Sample Population Captured By Public Urban Disease Control Center Toluca City, Mexico
A relevant consideration in veterinary practices is the occurrences of neoplasia in dogs, some of those tumors increase risk factor by different conditions related with affecting commonly owners' family relationship pet and care.
To determine the instantaneous prevalence tumors and neoplasia in dogs in a small group of urban homeless dogs from open population. Were studied 43 dogs of captured during summer to autumn fall 2004 by Centro Municipal de Control y Vigilancia Epidemiologica de la Rabia at Toluca city, México. Animals were submitted to Facultad de Medicina Veterinaria y Zootecnia-UAEM for veterinary pathology laboratory practices in collaborating epidemiological surveillance program. Dogs euthanasia was produced by intravenous overdose 20% sodium pentobarbital solution (Vetoquinol*, France). Postmortem study was conduced by routinely protocol describing gross pathology, histopathology tissue samples were fixed in 10% v/v buffered formalin solution pH 7.4 glass slide preparation were performed by paraffin inclusion technique stained with hematoxylin-eosin, masson trichromic and PAS periodic acid stain. The pathological findings were evaluated considering age, sex, breed type and weight using Man Whitney and Ji - square tests (p< 0.05).
The results obtained were dog type distribution; 53.4% Criollo race breed, 28% hybrid breed and 18.6% different type breed. Weight range 6.3 to 43.1 K and average age was 62 months old. Instantaneous prevalence rate was 11.62 in 100 animals (5/43) affected by tumors causing metastases in thoracic and abdominal cavity organs (P<0.01). The previous mammary gland tumor evidence was observed tree cases of hybrid female dogs. It were classified as mix mammary gland tumor, rich fat cells carcinoma and papillary adenocarcinoma (p<0.05). The other neoplasia were; hemangiosarcoma, and acinar adenocarcinoma of large intestine, tumors were located causing local and extensive metastasis considered as clinical and postmortem pathological findings in mature female and male dogs. Tumor association was founded in; race type breed, sex was strong related with mammary gland tumors (p<0.001) and age was related with other neoplasia (p< 0.001).
The study suggest a increase case of neoplastic diseases in urban dog population occurring cases in old and mature canine type breed unrelated.
1. Seacy,GP. The hematopoietic system:in Thomson's special veterinary pathology. Mosby, St. Louis, USA. 2001. Chapter 7 pp 3.
2. Head,KW., Cullen, JM. et al.,. Histological classification of mammary gland tumors of dog and cat. Armed Forces Institute of Pathology in cooperation with American registry of Pathology and the World Health Organization, collaborating Center for World Wide Reference Comparative Oncology. Washington , DC . 1999. pp. 18-20.