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Cysteine excess with methionine deficiency in puppies resulted in foot pad lesions<ref name="Burns"/>. Excess methionine intake in adult dogs can result in ataxia, disorientation, lethargy, [[Vomiting|vomiting]] and ptylism<ref>Biourge VC, et al. Methionine toxicosis in a group of hunting dogs. Proc Am Acad Vet Nutr Res Symp Dallas, TX. 2002, p.9-10.</ref>.
 
Cysteine excess with methionine deficiency in puppies resulted in foot pad lesions<ref name="Burns"/>. Excess methionine intake in adult dogs can result in ataxia, disorientation, lethargy, [[Vomiting|vomiting]] and ptylism<ref>Biourge VC, et al. Methionine toxicosis in a group of hunting dogs. Proc Am Acad Vet Nutr Res Symp Dallas, TX. 2002, p.9-10.</ref>.
 
====Cats:====
 
====Cats:====
Kittens fed methionine in excess of 10 times the growth requirements experienced a decrease in weight gain though no other signs of toxicity<ref>Taylor TP, et al. Optimizing the pattern of essential amino acids as the sole source of dietary nitrogen supports near maximal growth in kittens. J Nutr 1996;126:2243-2252.</ref>. Adult cats given excess methionine developed severe haemolytic [[Regenerative and Non-Regenerative Anaemias|anaemia]] with methaemoglobinemia and Heinz body formation<ref>Maede Y, et al. Methionine toxicosis in cats. AJVR 1987;48:289-292.</ref>.
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Kittens fed methionine in excess of 10 times the growth requirements experienced a decrease in weight gain though no other signs of toxicity<ref>Taylor TP, et al. Optimizing the pattern of essential amino acids as the sole source of dietary nitrogen supports near maximal growth in kittens. J Nutr 1996;126:2243-2252.</ref>. Adult cats given excess methionine developed severe haemolytic [[Regenerative and Non-Regenerative Anaemias|anaemia]] with methaemoglobinemia and [[Heinz Body Anaemia|Heinz body formation]]<ref>Maede Y, et al. Methionine toxicosis in cats. AJVR 1987;48:289-292.</ref>.
    
==Dietary Sources==
 
==Dietary Sources==

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