My dog has eaten the sd cat food a couple of times with no problems (not as much but he's a weeny little dog so prolly in proportion to your lab). You could ring your vet & ask.
I wouldn't think the once off labrador thing will be too bad. The worry is the lower protein, and the PH balancer really, but its definately not as bad as digging something up and eating it, or anything. There won't be any long term affects . My labrador ate 1 kg of feline k/d... she got into it at work!!!
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