I do not understand a text in English

I am an English Bulgarian translator and have come across a text which I cannot make out. It's the following (full context):

I wish I could give you a helping hand. But things are tight. I had six cross doubles the other day. Three came home. Number four developed rheumatism at the last hurdle. I went without food for two days.

Dooes this refer to betting on a game, or to breeding or to something else?

I would appreciate any help on the subject or advice as to who to turn to. Many thanks!

Galina Tomova
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