"Do you have a horse?"
Translation:У тебя есть лошадь?
I dont hear "л" to v, maybe the audio is messed up and has since been fixed. As for г to v, it sounds like "v" in many common words that are derived from genitive endings, and as such, is a phonetic exception. Just learn them as you go, some examples are сегодня, ничего, and кого.