豚 and 羊: animals and materials from them
Distinguish pigs and sheep themselves from combinations referring to meat, wool, or depictions.
The animal called 豚
豚, read ぶた, means pig. 小屋に豚がいます。 says that a pig is in a small shed or animal shelter.
豚を見ました。 means seeing a pig. It does not mean eating pork.
The animal called 羊
羊, read ひつじ, means sheep. 白い羊が歩いています。 says that a white sheep is walking.
羊の毛を見ました。 means looking at sheep's wool. 毛 identifies the observed object as the hair or wool.
Animals and materials
豚肉は買いましたが、羊の肉は買いませんでした。 says that pork was bought but sheep meat was not. 肉 makes this a sentence about ingredients.
羊の絵を描きました。 means drawing a picture of a sheep. 絵 rules out interpreting it as creating or raising an actual sheep.
What was viewed in 羊の毛を見ました?
Show the answer and why
Sheep's wool. Read 毛 as well as 羊.