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==Toxicity/Excess==
==Toxicity/Excess==
[[File:Struvite crystals (urine) - Strüvit kristalleri (idrar) - 02.png|200px|right|thumb|Struvite crystals in urine]]
[[File:Struvite stones.JPG|200px|right|thumb|Struvite urolith removed form a dog's bladder]]
===Dog: ===
===Dog: ===
There is no direct information on dietary toxicity of magnesium in dogs. It has been reported that diets containing up to 0.2% DM magnesium (providing 3 to 5 times their requirement)<ref name="FEDIAF" /> have no adverse effects in adult dogs.
There is no direct information on dietary toxicity of magnesium in dogs. It has been reported that diets containing up to 0.2% DM magnesium (providing 3 to 5 times their requirement)<ref name="FEDIAF" /> have no adverse effects in adult dogs.
===Cat:===
===Cat:===
There is ample evidence that increasing dietary magnesium is associated with urinary tract disease in cats, notably the formation of [[Urolithiasis|uroliths]] composed of struvite (i.e. magnesium ammonium phosphate) <font color="red">[DC to provide image of uroliths]</font>. Dietary magnesium above 0.1% DM had previously been implicated in urolithiasis, however it is thought that this is an indirect effect of magnesium salts, increasing urinary pH which is permissive for struvite stones, rather than a direct effect of magnesium on struvite formation. An increase in urine volume can have some ameliorating effect but acidification of the urine (pH around 6.5) substantially increases the solubility of struvite and is the most effective way of dealing with struvite uroliths<ref>Markwell, PJ, Buffington,T, Smith, BHE. (1998). '''The effect of diet on lower urinary tract disease in cats'''''. J Nutr.'' 128(suppl.):2753S-2757S.</ref>.
There is ample evidence that increasing dietary magnesium is associated with urinary tract disease in cats, notably the formation of [[Urolithiasis|uroliths]] composed of struvite (i.e. magnesium ammonium phosphate). Dietary magnesium above 0.1% DM had previously been implicated in urolithiasis, however it is thought that this is an indirect effect of magnesium salts, increasing urinary pH which is permissive for struvite stones, rather than a direct effect of magnesium on struvite formation. An increase in urine volume can have some ameliorating effect but acidification of the urine (pH around 6.5) substantially increases the solubility of struvite and is the most effective way of dealing with struvite uroliths<ref>Markwell, PJ, Buffington,T, Smith, BHE. (1998). '''The effect of diet on lower urinary tract disease in cats'''''. J Nutr.'' 128(suppl.):2753S-2757S.</ref>.
==Dietary Sources==
==Dietary Sources==