Составь предложение по английски: кот и собака друзья.

The translation for your sentence is: "The cat and the dog are friends." To break it down for you:

• The cat and the dog — This is your subject. Using the definite article "the" is standard if you are referring to a specific pair of animals.
• Are — This is the plural form of the verb "to be," used because you have two subjects (a cat and a dog).
• Friends — This is the plural noun describing their relationship.

If you want to sound more natural or poetic, you could also say:

• "A cat and a dog are friends" (speaking in general terms).
• "The cat and dog are buddies" (more informal).

Would you like to see how to use this in a longer story or perhaps translate another phrase?