Я хочу поиграть с собакой.

Breakdown of Я хочу поиграть с собакой.

я
I
собака
dog
хотеть
to want
с
with (also со)
поиграть
to play for a while

Questions & Answers about Я хочу поиграть с собакой.

Why use поиграть here instead of the standard verb играть?
The prefix по- turns the imperfective verb играть (to play) into the perfective verb поиграть. In this context, по- is a delimitative prefix, meaning it limits the action to a short, casual amount of time. That is why the English translation adds 'for a bit'.
Would it be wrong to say Я хочу играть с собакой?
It is perfectly correct, but the nuance changes. Using the imperfective играть just states a general desire to do the activity ('I want to play'). Using the perfective поиграть focuses on completing a specific, short-term action ('I want to play for a little while').
Why does the word for dog change to собакой here?
It is in the instrumental case. When the preposition с means 'with' (as in interacting or doing something together), it forces the following noun into the instrumental case. For a feminine noun ending in -а like собака, the ending becomes -ой.

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