Tame 2-star wolves and breed them around your base. They will kill all mobs that dare to come close. Once a day you run around an collect all the drops they leave, leaving the meat for them to breed further. But please watch a YT video on taming 2-star wolves because it is a bit different than taming a single star or no star wolves. That is my strategy for the base defense. Now after hundreds of ingame days i have more than 50 2-star wolves wandering around in the woods :)