Get a spreader and some sand and some DE - Diatomaceous Earth - (FOOD GRADE...NOT THE KIND FOR SWIMMING POOLS) ... and spread it all over the yard. It'll kill even whipworms, which are almost impossible to eradicate.
We also use this for worming the dogs. 1 Tablespoon in the food....repeat in 10 days. OR you can use a little routinely.
Here's a link where you can buy it. It's cheap as dirt...LOL:
Gosh you do not have it easy with your dogs......thinking of you. We are blessed here, hardly any worms and no ticks or fleas. So I am not much help. I just hope you can get it all sorted........Ronnie
Geez LBNessa! Just when you get the fam straightened out something else happens.
No advice here but I will throw in a sympathy hug for ya..
I hope the solutions that Donna and Becky spoke of above work for you.