Apostrophe Placement with Cow's Milk and Goat's Cheese

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The milk you buy from a shop is cow's milk not cows' milk.
  • I cannot drink warm cow's milk.
The apostrophe goes before the s because it is the milk of a cow (i.e., of an animal known as a cow). In other words, it is not about how many cows produced the milk. It is about what kind of animal produced the milk. It is the same with goat's cheese.
  • I find goat's cheese too overpowering.

Cow's Milk or Cows' Milk?

Writers are often unsure whether to write cow's milk or cows' milk. This confusion arises because of a rule for the possessive apostrophe which states that the apostrophe goes before the s for a singular possessor (e.g., one dog's kennel) but after the s for a plural possessor (e.g., two dogs' kennel).

With milk, however, there is a quirk. It is not about how many cows produced the milk. It is about what kind of animal produced the milk. This is why the milk we put in our coffee is cow's milk (the milk of an animal called a cow) and not cows' milk (the milk from several cows). For example:
  • I'm not sure this is cow's milk.
  • I'm not sure this is cows' milk.
There are, however, times when cows' milk is correct.

Cow's Milk

The milk you buy from a shop is cow's milk. (It translates best as the milk of a cow with the idea being the milk of an animal known as a cow as opposed to the milk of a single cow.) For example:
  • Did you put cow's milk in the jug? It smells a bit like goat's milk.
It possible for cow's milk to be used in a slightly different context (i.e., when you're referring to one specific cow). For example:
  • I only have two cows. This cow's milk is fine, but that cow's milk is watery.

Cows' Milk

Of course, a situation could also arise when you need to talk about the milk of specific cows. For example:
  • I only have two herds of cows. These cows' milk is fine, but those cows' milk is watery.

Goat's Cheese or Goats' Cheese?

The same situation applies to cheese made from goat's milk. It is not about how many goats produced the milk for the cheese. It is about what kind of animal produced the milk for the cheese. In other words, it is goat's cheese (from an animal called a goat) and not goats' cheese (from several goats). For example:
  • This pizza has goat's cheese on it.
  • This pizza has goats' cheese on it.




Using apostrophes Apostrophes in time expressions

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