I'll ruin the ending right off the bat for this one, provided you've read Roald Dahl's "Lamb to the Slaughter." Yes, sheep-based evidence gets eaten by the police.
Unfortunately, Dahl's is a far better story. One positive about Richard Rupnarain's "Where is the Mutton?" is that it's set in Guyana. I've never read anything from Guyana before, so that angle was interesting. The dialogue is a bit difficult, but not impossible to make out. The plot, however, takes a while to come, the second half seems disjointed from the first half of the story, and it's sadly unoriginal.