I have owned my Paso for about 5 years, he is 15 years old. He has always been eager to run and work. I live in Florida and its about 90 degrees when I ride him at dusk. For the last month I have noticed that he is breathing very heavily while working out. He normally sweats plenty, and breaths hard... but recently after a good workout it takes about 45+ minutes for his breathing to go back to normal (Between 8-14 breaths per minute). Is it normal for a horse in the summer to take this long to cool? I sponge/bathe him always after a work out, but he just remains incredibly hot. Others at my barn ride their horse as long as I do, and it only takes them about half the time it takes my horse for its breathing to return to normal. After a work out my Paso used to breathe normally after a good walk, what could have changed this?