Number + Classifier (只) + 狗
The noun 狗 (gǒu) is the standard Chinese word for 'dog.' It can be used on its own or combined with modifiers such as 小 (small) to form compound nouns like 小狗 (puppy). When counting dogs, a classifier such as 只 is typically used before 狗.
我家的狗特别喜欢在公园里跑。
Wǒ jiā de gǒu tèbié xǐhuān zài gōngyuán lǐ pǎo.
My dog especially loves running in the park.
她养了两只狗,一只是金毛,一只是柯基。
Tā yǎng le liǎng zhī gǒu, yī zhī shì jīnmáo, yī zhī shì kējī.
She has two dogs — one is a Golden Retriever and the other is a Corgi.
那只狗一看到我就摇尾巴。
Nà zhī gǒu yī kàn dào wǒ jiù yáo wěiba.
That dog wags its tail as soon as it sees me.