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All cats used for producing immunoglobulins are screened and tested virus negative, Also distemper and leukemia virusses apear in cats and have their specific IgG antibodies that are very stable, Cat seras have usually higher IgG tirters than dog serum, Feline range = 10 to 20 mg/ml IgGs, Sometimes til 5% of an area felines have specific IgGs , From Canis lupus or the domestic dog we know mostly the Beagle to be used in drug discovery experiments, for the feline retroviral feLV infecting Felidae |