New from j.k. rowling toads
Of the three approved animals permitted to students as pets at Hogwarts, the toad is, and has been for many years now, by far the least popular. Centuries ago, in blood-thirstier times, when young witches and wizards were expected to personally pop out the newt eyes they were using in potions, they routinely brought boxes of toads to school for use in potions and in other charms. Over time, as the Ministry of Magic introduced legislation regarding animal cruelty (sub-sections 13-29 inclusive relate to potion ingredients and their production) such practices were gradually outlawed. The toad, never much appreciated for its own personal appeal, gradually appeared (alive) less and less frequently at Hogwarts, unless hopping and swimming wild in the grounds.
By the time Harry arrived at Hogwarts, possession of a pet toad conveyed neither cool nor status; indeed, it was something of an embarrassment. Trevor, Neville's toad, had nothing to commend him except a propensity for getting lost, and when he finally slipped off to join his brethren in the Hogwarts lake, both owner and pet felt a sense of relief.