You should gain XP. It maybe that the wolf has such poor HP that the first trap took him out, you may find the XP for it right at the very top but it's such a paltry amount it's not worth fussing over.
PS. How many traps did you lay to take out a pair of Golems with them?
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It's bleedin dark down here, slippery too.
Man, that's a pisser.