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.
その雄犬は子犬のころから元気いっぱいだった。
That male dog has been full of energy since he was a puppy.
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.