I also like sheep a lot, can't be considered the weakest track in the album, I think it's a very very good song, of course, Dogs and Pigs 3DO are better, pigs on the wing by themselves I think are weaker. Nobody can say that pigs on the wing part 1 is better than sheep. I mean a 1:30 minute song vs. a 10+ min. song, it's clear that sheep has a lot more talent and quality in it. Still pigs on te wing are great songs, perfect intro and outro to the album. The version with snowy white is awesome, and feels like more of a complete song in my opinion. Still, one can't imagine listening to animals without the intro and the hopefulness of Pigs on the wing part 2, which I consider to be an uplifting song, compared to the rest of the album.
While we are on this subject let's talk about the 'Raving and Drooling' and 'You Gotta be crazy' from the Azimuth Coordinator bootleg. Who thinks these are the best versions of these songs, or who can propose better versions in other ROIOS.

See ya, in the summer of '68

__________________
who are you and who am I
to say we know the reasons why
some are born and some men die
beneath some infinite sky...
so all things time will mend
so this song will end

Gilmour in 'Childhood's End'