^True. LBT 5 had the subject of specieism though not nearly as distinct as the original or LBT 4. If you read between the lines of Tippy's Mother and consider how she reacts, then you will notice that she, while not showing it openly, doesn't really approve of Spike living with a family not of his own kind (although she does approve that they took him for the sake of not being completely on his own). She's trying to pull Spike away from his "foster family" and "adopt" him herself. Well, of course there's no bad will in her, only instinct and education making her act the way she did.
LBT 6 has a fairly good example too, Topsy plotting against the Longnecks.
LBT 7 has a bit of a anti-specieism thing since we see the mixed herd and otherwise no specieistic events. Though Petrie's and Cera's argument at the beginning takes on the question, whether flyers are best or not

In LBT 9 the adults are being specieists towards the creatures in the new water. Though Grandpa has a view that is clearly not specieistic. "In a world so full of life you're only as alone as you choose to be." Besides, the Longneck mother doesn't mind the others either, nor do Moe's water kin.
LBT 10 doesn't have any speciesm I think. Only old Longneck stories and a statemenr of Bron that might be considered as such ("Sharpteeth are cowards." --> prejudices. The Sharptooth from the Original clearly wasn't)
LBT 11 again has a lot of it. The tiny Longnecks are being discriminated against and neither Topsy nor Big Daddy see reason until late in the end.
In LBT 12 only Petrie's siblings show speciesm to a certain degree (though it might as well just bullying of Guido

)
LBT 13 is free of it (except they think very low of the Yellowbellies because they're so dumb

)
The Tv-series doesn't have much of it I believe...