The other day (Thursday) I took Shasta out for some training and a walk. We didn't have enough time for a trip to the lake for some hunting, so we went up to Highland Glen to see if it was frozen. It was, except for a spot about 2' in diameter. And there was a duck sitting on that one spot. Well, Shasta headed for the bird, and went through the ice. She managed to get back to shore by breaking the ice back to the bank. She was only about 15' from the bank, in water shallow enough that I could have gotten to her if necessary. That evening she acted fine but tired, and she seemed OK yesterday as well. This morning she acted fine, but tonight she is whining in pain, and favoring her left front leg. She has been with me all day, and hasn't done anything to injure herself. My question is, would it take 2 days for a dog to react to an injury? She was in the water for only a couple of minutes, and wasn't afraid to go back on the ice. Her appetite is normal, as is her outdoor schedule. She doesn't limp when walking or jumping on to the bed, just when she rolls on to her left side and tries to get up. She walks fine after she gets up. Any ideas would be appreciated. Can dogs have aspirin, and what dose? She weighs about 70 pounds.