Identify the number of preposition(s) in this sentence: 

We never go to the park with my dog.

Words that usually precede nouns or pronouns and express their relation with other parts of the sentence are known as prepositions. Prepositions can be of several types, depending upon their usage. In the statement given in the question, "We never go to the park with my dog," there are two prepositions, "to", and "with". "To" is the preposition of place, while "with" is a preposition of possession.