Great hotel but a little hard to find
BW Posada Ana is a wonderful inexpensive hotel that loves dogs. Very friendly staff especially Bonnie, the breakfast cook. 
It is hard to find off the I-410 airport exit but luckily for me the San Antonio drivers are friendly to lost tourist as i had to cut off a few cars to find the correct turn lanes.
Great area behind the hotel for the dogs to run. A Walmart with cheap gas is close by.