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Flomax (tamsulosin) is actually used in dogs for urinary problems and the dose range for a dog of his size would be between 0.1-0.2mg/day. Even if he ingested a .04 mg tablet, it would be well within the dose range, so I would not expect any problems.
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My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.
I just reread you original post and I am thinking that you may have meant he possibly ingested a 0.4 mg capsule which is how they are usually produced. If that was the case, he should still be in the safety range and the worst that we may see due to his body not being used to this drug is a little bit of hypotension. I would monitor him for any signs of weakness or lethargy and if any are noted, have him examined by a veterinarian right away.