Oh, so sorry for what you're going through - that's really awful! But I did read somewhere that to prevent ants, bugs, etc. from getting to the dog's food, or the entire crate, you can put down 2-sided tape on the floor as a barrier. Also, if the bugs are bigger, then on top of that tape barrier around the crate, add a nice thick coat of vaseline. At least this will give you peace of mind that if they DO reappear, they will not get at your pup in his crate. And if they can't get to the food, they have no reason to return. Trust me, I researched it because when Rocco was only 9 weeks old, he woke me with frantic cries for help and ran around throwing himself onto the floor. I figured out that an ant got into his crate and then inside his ear while he slept and must have bit him
! It took another week for him to go into his crate and to this day he HATES ants.