Passejo la mascota amb la corretja.

Catalan often leaves subject pronouns out because the verb ending already shows the subject. Passejo by itself tells you the subject is I.

You can add jo for emphasis or contrast, for example: Jo passejo la mascota, no tu. = I’m the one who walks the pet, not you.

Passejo is the 1st person singular present indicative of passejar.

Here, passejar is used transitively, which means it takes a direct object: la mascota. In this use, it means to take someone/something for a walk or to walk a pet.

Without an object, passejo can also mean I go for a walk or I stroll.

Because caminar usually means to walk yourself, while passejar can mean to take someone or something for a walk.

So:

• Camino amb la mascota = I walk with the pet
• Passejo la mascota = I walk the pet

That difference is very important.

Because it refers to a specific pet, so Catalan normally uses the definite article: la mascota = the pet.

Catalan uses articles quite naturally with nouns, often more consistently than English does. If you meant a non-specific pet, you could say una mascota.

Literally, it means with the leash. In this sentence, it is understood as using the leash or on the leash.

So it does not just mean that the leash happens to be nearby. It means the leash is part of how the pet is being walked.

Because corretja is another noun, and here it is treated as a specific, known leash: the leash.

Compare:

• amb la corretja = with the leash
• amb una corretja = with a leash

Both are possible, but la corretja sounds like a particular leash the speaker has in mind.

No. Passejo amb la mascota means I go for a walk with the pet. The pet is accompanying you.

But Passejo la mascota means I am walking the pet.

So adding or removing that direct object changes the meaning a lot.

It is correct, but it is quite general. Mascota means pet.

In everyday speech, people often use the specific animal instead, especially if it is a dog:

• Passejo el gos amb la corretja. = I walk the dog with the leash.

So mascota is fine, but sometimes a more specific noun sounds more natural.

No.

• corretja = leash / lead / strap
• collar = collar

So in this sentence, corretja is the thing you hold while walking the pet, not the thing around the animal’s neck.

Yes. If the pet is already known from context, Catalan would often use a direct object pronoun:

La passejo amb la corretja.

That means I walk her/it with the leash.

This is very common in Catalan once the object has already been mentioned.