These days cockroaches have plundered my house! Cockroaches always hailed in my house but they hardly bothered; two or three could be found under the sink or at the attic. But they have multiplied at a mammoth rate recently! Huge numbers of nymphs roam on the table at the verandah at night; things went worst when today I saw many nymphs floating on the drinking water I stored in a pan. Even they don't spare the fridge!! I kept my chipps & cakes at the fridge but was at the blues when I saw cockroaches already enjoying the snacks!! I have used pesticide(spray); yes it killed many but was only temporarily successful. On the 5th or 6th day, I could again see cockroaches. And recently(day before yesterday), I again sprayed on the table at verandah & at the morning I saw many nymphs dead but yesterday I saw with disgust they were resurrected again:( I am very dubious of the effectiveness on the spray; moreover I don't want to use such things as I have a pet dog; he always licks his paw & pesticide might stick on his paw; he has his drinking-water outside & though I cover it before spraying, it still gets contaminated. I don't want my dog to get die in the course of removing cockroaches. So, is there any "natural trick" or any means that permanently help me get rid of these cockroaches unlike spray & also not harm my dog??
Edit: I can't afford for professional experts; after all there is no such thing or such service at our state. I'm living in a small state of India.