This weed can have devastating effects on horses.

With plenty of rain, many weeds that are lying dormant in the ground start to germinate and pop up everywhere. Some of these are harmless but if you have horses, many of these weeds can kill your horses or cause long term damage to your horses. Best to be on the lookout in order to avoid disaster.
Below are some useful links that go into more detail about these toxic weeds.

Petterson's Curse and your Horse.
https://www.dpi.nsw.gov.au/__data/assets/pdf_file/0011/88490/patersons-curse.pdf

Capeweed and your Horse.
https://bioweed.com.au/navigating-capeweed-and-horses

False Dandelion and Horses.
https://wagwalking.com/horse/condition/false-dandelion-poisoning