To dream that you see the yak in the dream foretells about the ability to adapt in various and difficult conditions. The dream shows that sometimes the life puts you into very hard circumstances, but you manage to get through no matter what the life brings you. The yak could also indicate some person in your life who has abilities to stay strong.
Dream dictionary: Yak dream meanings
When in your dream a yak appears, then such a dream denotes your unique talents and skills. There is other meaning of a yak which shows your stubbornness and disobedience. Sometimes it is better to stop talking too much and try to listen what people around you want to tell you. This also may be a possibility to use others help.