Hei man, try this:
import urllib2
import re
from bs4 import BeautifulSoup
import time
date = (time.strftime('%Y%m%d'))
symbolslist = open('pistas.txt').read().split()
for symbol in symbolslist:
url = "http://trackinfo.com/entries-race.jsp?raceid=" + symbol + "$" + date +"A01"
htmltext = BeautifulSoup(urllib2.urlopen(url).read())
names=htmltext.findAll('a',{'href':re.compile("dog")})
for name in names:
results = ' '.join(name.string.split())
print results