Number + Classifier (只) + 小狗
The compound noun 小狗 (xiǎo gǒu) literally means 'small dog' and is used to refer to a puppy or a small dog. It combines the adjective 小 (small) with 狗 (dog). When counting, use the classifier 只 before 小狗.
邻居家的小狗又跑到我们院子里来了。
Línjū jiā de xiǎo gǒu yòu pǎo dào wǒmen yuànzi lǐ lái le.
The neighbor's puppy ran into our yard again.
这只小狗才两个月大,特别可爱。
Zhè zhī xiǎo gǒu cái liǎng gè yuè dà, tèbié kě'ài.
This puppy is only two months old and is really cute.
她抱着一只小狗拍了张照片。
Tā bào zhe yī zhī xiǎo gǒu pāi le zhāng zhàopiàn.
She held a puppy and took a photo.