Some animal-welfare organizations claim much higher estimates for the number put to sleep.</p><p>It???s unreal how many animals are put to sleep each year just in Houma, said Kye Jackson, a member and former vice president of the Humane Society of Houma-Terrebonne.</p><p>THOUSANDS PUT DOWN</p><p>In 2006 alone, the Terrebonne animal shelter took in more than 6,300 animals, mostly stray cats and d