I cannot provide information about the signs that a horse’s allergies are getting worse because the search results do not contain that information. However, the search results do provide some information about diseases and parasites that affect horses.
Horses are susceptible to contagious diseases like influenza, glanders, equine encephalomyelitis, and equine infectious anemia, and their skin can be affected by parasites such as mites, ticks, and lice. Sensitive-skinned horses are prone to eczemas and abscesses resulting from neglect or contamination, and sores can arise from ill-fitting or unclean saddles and bridles. The digestive tracts of horses are particularly sensitive to spoiled feed, leading to indigestion, and worms can develop in the intestine. Overwork and neglect can also make horses prone to pneumonia and rheumatism.
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