I'm having trouble making sense of this sentence.

Here's the context:
Person 1: А откуда удочка у Мамы Свинки?
Person 2: Это дали собак.

I understand собак is the genitive plural of собака. I'm wondering if the reason it's in genitive form is to give the effect of "some", as in, "some dogs gave it". Am I close?

https://learn-russian.livejournal.com/1067740.html