Male Dog
noun
A male dog is a male dog.
It's worth mentioning that you'll see this most often written in katakana, as both オス犬 and オスの犬.
The readings are the kun'yomi readings, which is probably A-Okay for 犬, but for 雄 you'll want to think about how a male dog is probably pretty pushy, always trying to push (押す) other dogs around, being male and moody and all that.
こちらの商品は、雄犬専用のトイレになります。
This product is a toilet for male dogs only.
あそこの動物病院、大型の雄犬の去勢手術は三万円ぐらいだったはず。
I believe the cost of neutering a large male dog at that veterinary clinic was around 30,000 yen.
脱走していた雄犬が、先程無事に保護されました｡
The male dog that had escaped has just been safely captured.