Conclusion: No difference with other food, everything OK (Further research to be completely conclusive?).
Gives also the analysis of some popular brands. E.g that Yarrah is the only one with taurine & L-carnitine, not that it matters much.
Short summary articles about it: https://www.vegan.at/inhalt/diplomarbeit-ueber-vegane-hunde-und-katzenernaehrung
Article about it: Husky trial shows dogs can thrive as vegetarians - https://www.une.edu.au/connect/news/2009/12/husky-trial-shows-dogs-can-thrive-as-vegetarians
Taurine Most mammals produce their own taurine from precursors. (except cats) Ruby: but controversy lately in professional circles
L-Carnitine
L-carnitine becomes unavailable in pet food through processing, and is generally not added back due to its high cost.
L-carnitine is a natural substance found in food, mainly meat. However, it is not considered an essential nutrient because the body can make it from the amino acids lysine and methionine.