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Hemangiosarcoma is a rapidly growing, highly invasive variety of cancer that occurs almost exclusively in dogs, and only rarely in cats, horses, mice, [1] or humans (vinyl chloride toxicity). It is a sarcoma arising from the lining of blood vessels; that is, blood-filled channels and spaces are commonly observed microscopically.
A typical Flat-Coated Retriever expression. Originating in the mid-19th century in England, the Flat-Coated Retriever gained popularity as a gamekeeper’s dog. Part of its ancestry is thought to have come from stock imported from North America from the now extinct St. John's water dog, but this is unverified.
Histiocytoma is a benign skin tumor that is more frequent in young dogs (<4 years), and often regresses without treatment. [165] Malignant histiocytosis (histiocytic sarcoma) is an aggressive cancer found primarily in certain breeds including the Bernese Mountain Dog, rottweiler, golden retriever and flat coated retriever.
In general, dogs age in a manner similar to humans. Their bodies begin to develop problems that are less common at younger ages, they are more prone to serious or fatal conditions such as cancer, stroke, etc. They become less physically active and less mobile and may develop joint problems such as arthritis.
A mastocytoma in dogs (or mast cell tumor in dogs) is a neoplasm originating from mast cells in the domestic dog, which occurs mainly in the skin and subcutis. Mastocytoma are not only extremely common in dogs, but also tend to be much more malignant in them than in other animal species.
Canine histiocytoma cytology. A histiocytoma originates from epidermal Langerhans cells of antigen-presenting cell lineage. [4] Spontaneous regression is common in these tumors, and it is mediated by infiltration of CD8-expressing T cells followed by expression of Type 1 T helper cell cytokines (such as Interferon-gamma) and recruitment of antitumour effector cells.
The Golden Retriever is a Scottish breed of retriever dog of medium size. It is characterised by a gentle and affectionate nature and a striking golden coat. It is a working dog, and registration is subject to successful completion of a working trial. [2]
In the future, genetic testing may show which of these variants in color are actually linked to health problems and which are not, which may lead to modification of the breed standards. Other breeds such as the Flat-coated Retriever only black and liver are acceptable, but yellow is a disqualification.