Lost Dog (Victoria Park/Lawrence)

I'm looking for a large, black brindle dog. My sister and I saw it all alone, no tags, we tried to get it but it was fearful of us. We chased it for about 20 mintues before we lost sight. We searched for another half hour before we had to give up. This is not my dog. I don't know the dog's age, sex, or name. But I am very worried for it's safety. It is not afraid to go onto the street, but seems to understand not to run directly in front of cars. It appears to be a Mastiff mix, with maybe a hound. It is around 60-100 pounds, I'm not sure because I couldn't get too close. I do not have a picture of the dog, but I will attach a picture of a dog that looks similar. It doesn't seem aggressive, just very frightened. It was last seen in the Victoria Park/ Lawrence area. If you have any information, please contact me at 416-391-1163 or allie.bedallie@hotmail.com . Thank you.