My fort is suffering a sheepsplosion after I let the breeding population increase to around 40. I wanted wool for clothes, but now my dwarfs are still spinning when the seasons roll around and it's time to start shearing again. Further, my cloth stockpiles are now full of bins of sheep wool cloth. I ordered a cull of about half the adults. Now the butchers shop is stinking out the kitchens: all my dwarfs on only food hauling and refuse hauling are still not enough to cope.
Also, the fort had a puppy who apparently loved to jump onto the (inaccessible) top of the curtain wall and then fall 3 z-levels to the ground on the other side. Or something. I never saw it happen, just the "combat" reports when she hit the ground. She grew up and still carried on this habit until she smashed her paw to pulp. So I put her out of her misery.