I thought you were wrong, but I do think they were also implying that they are managing tons of work and him at the same time and they can't do both.It's pretty vague in the original text too, but the localization makes it even vaguer, you arrive to the conclusion because it's really the only option, but I feel LHTranslation's localization of the translation takes away a bit from this manga, that's just my opinion though.
Bro, they live in a forest where even the rabbits have fangs, he had to move 5km just to find a source of water, and a random tree in the middle of the clearing is thicker than a fucking skyscrapper. For all we know that place could be bigger than Brazil and his "unnumbered inbred dogs" aren't even a rounding error to the regular population there. 👀So what do his unnumbered inbred dogs eat, tomatoes? Game from the forest, which is somehow enough for all of them, despite them multiplying in geometric progression?
Really, it's all just so much bullshit.