I said goodbye to my best critter friend today and about ripped my heart out, she was 6. RIP Sugar, my oldest Oberhasli goat doe. I am sharing what happened with all of you because its my fault. I have kept goats all my life, starting around 11 years old. A few years without when I had to live in town. I have always used the pelleted type goat wormer. One of my girls lived to 14 years old! I was also naive to the fact it does not kill all worms goats can get. Had my vet out to look at her and do fecals on everyone. She had a "barber pole" worm infestation, and it took her life this morning. Devastated, anyone that's ever met Sugar knows she was pretty special, and like a family dog to us. Here is one link I found for those that keep goats, or plan to, just a short summary of what it is:
https://thefreerangelife.com/barber-pole-worms-in-goats/
This was a new one on me, and cost me - dearly. No, we can't know everything, but its our responsibility to try. Deworming on schedule is great, but fecal tests and a vet is the true answer for proper care. Going forward I will have fecals done every 6 months, cows and goats.
So sorry to hear about your loss. Thank you for sharing with us, so we may avoid the heartbreak you're enduring now.