Weim comes back from walk with strong smell

I live in Northern CA on the coast in a wilderness area. Tonight I let out one of the dogs and heard him barking rather furiously as though he had encountered an animal. He eventually came back but had a strong oder on him; not from a skunk, but from something I could not recognize. He kept his eyes tightly closed and appeared to have something in them.

We washed out his eyes and bathed him; the oder gone and his eyes clear.

Any ideas re what he might have encountered? I imagine an animal sprayed him, but I can't figure out what it might have been.
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