Puer vestigium canis in luto videt et ridet.

Puer is in the nominative singular, the case normally used for the subject of a sentence in Latin.

So in Puer vestigium canis in luto videt et ridet, puer is the one who sees and laughs.

It also matches the verbs videt and ridet, which are both third person singular: he sees and he laughs.

Because vestigium is in the accusative singular, which is the case commonly used for the direct object.

The verb videt means sees, so the question is: sees what?
Answer: vestigium.

A learner may also notice that vestigium is a neuter second-declension noun, and for many neuter nouns, the nominative and accusative singular look the same. In this sentence, its role is clear from the meaning and structure: it is the object of videt.

Here canis is being understood as a genitive singular, so it means of the dog.

That is why vestigium canis means something like the dog's footprint/track.

This can be confusing because canis can also be nominative singular. The form is the same in both cases. Context tells you which one it is. In this sentence:

• puer is already the subject
• vestigium is the object
• so canis most naturally goes with vestigium as of the dog

Because in takes different cases depending on whether it shows location or motion toward.

• in + ablative = in/on somewhere, showing location
• in + accusative = into/onto somewhere, showing motion toward

So:

• in luto = in the mud
• in lutum would mean into the mud

Here the footprint is already located in the mud, so Latin uses the ablative: luto.

In Latin, one subject can easily go with more than one verb, just as in English.

So Puer ... videt et ridet means:

• The boy sees ...
• and laughs

Latin does not need to repeat puer before ridet, because it is already understood that the same boy is doing both actions.

The ending -t tells you that each verb is third person singular present active.

So:

• videt = he/she/it sees
• ridet = he/she/it laughs

Since the subject is puer, the natural translation is he sees and he laughs.

These are present-tense actions happening in the sentence now.

Classical Latin does not have articles like English the and a/an.

So a noun like puer can mean:

• boy
• a boy
• the boy

Likewise canis can mean dog or the dog, depending on context.

That means the translator has to choose the most natural English wording from the context.

Latin word order is more flexible than English word order because the endings show each word's job in the sentence.

So even though the sentence is written as:

Puer vestigium canis in luto videt et ridet

the roles are still clear because of the cases and verb endings.

A more literal unpacking would be:

• Puer = subject
• vestigium canis = object phrase
• in luto = prepositional phrase
• videt et ridet = verbs

Latin often puts the verb later in the sentence, but other orders are possible too.

It is a noun phrase made of:

• vestigium = footprint, track, or trace
• canis = of the dog

This is a very common Latin pattern: noun + genitive.

The genitive noun narrows or explains the first noun. So:

• vestigium canis = the dog's footprint
• literally, footprint of the dog

English often prefers 's, while Latin often uses the genitive case.

Not naturally in this sentence.

Even though canis can be nominative singular in form, the sentence already has a clear subject: puer.

Also, the phrase vestigium canis makes very good sense as the dog's footprint, while dog as another subject would not fit the sentence structure well.

So grammar and context together point to canis as genitive singular, not as the subject.

No. Ridet can stand on its own.

It means laughs or is laughing, and that idea does not require a direct object.

So the structure is:

• videt
  • object: vestigium canis
• ridet with no object

That is perfectly normal in Latin, just as in English: The boy sees the dog's footprint in the mud and laughs.