Closing day of goose season I went out for final chance to knock down some ganders. I was all alone with Anny.(Red Lab) Quiet morning. 12 degrees and the birds had been shot at a ton from this field but that's never stopped me before. I set up 3 dozen big foot decoys and as I was pouring my first cup of coffee .Two geese where buzzing the decoys. They worked in. Knocked em down. Sent Anny out for the go bird. Here. Heel. Sit. Sent for memory bird. Two birds in the blind. Got coffee headed down the pipe. Here comes a flight of 20-40 birds honking and a looking. Got em in and knocked down two. Quick final day. Sent Anny down for the go bird. Here. Heel. Sit. Sent her for the memory bird. BIG MISTAKE. The honker was a cripple and I knew it. But to what degree of functionality did it have I was soon to find out. Anny hit her line hard and straight and as soon as this honker saw her he started to run and pump those wings like mad. Elevated at 3 feet off the ground it took off and so did Anny. Off they went and at 150 yards out the bird still 3 feet off banked right hard and caught the wind at its back. More speed and now headed towards a 2 lane frontage road. I looked for cars and saw none. Tried to whistle her in but too far out and no chance whatso ever. She was a red dot chasing this big ol gray dot. Down a bank and out of site. I see cars coming on the frontage road and I start hauling out in that direction. To my relief, I see her in the distance with a big ol goose coming in. Rules of the game. Never send a dog out for a cripple where there may be harms way. Roads, barb wire fences, ice ponds or creeks, etc. I would have been better off walking on a heel and creating a walk up scenario. I was home in 1 hour from set up to pick up. I consider my self fortunate to have not lost my dog. Lesson for me. Won't happen again.