This is called a "Mighty Mouse" cartoon but he really doesn't enter until just past the halfway point. Actually, the cartoon is a lot better (funnier and clever) BEFORE Mighty Mouse enters the picture.
The wolves in here are a hoot, right from the start. The tricks they employ and they lengths they go to, to snare a lamb, are very funny. Some of this stuff was even a little risqué. One wolf is designated to go out and lure a little lamb into their wolves' den. He dresses up as a woman, with exaggerated big breasts which draws whistles from his peers.
The wolf then prances out playing "Mary Had A Little Lamb" on a flute. When the sheep lifts his skirt and sees he's no she, the wolf tries another plan: he plays jazz on a trumpet. The sheep follows him into the den. (This is a weird cartoon.) Anyway, all the wolves then try to kill the more little animal, whose bleats are heard by Mighty Mouse, who just happened to flying around the neighbor.
Mighty Mouse then saves the day. I have to say this mouse didn't look like the Mighty Mouse I used to watch as a little kid.