The meteor was, according to NASA, about 2 feet across and weighed 1000 pounds. So their baby elephants are on the lighter side and their corgis are fairly normal size.

I'm going to assume a sphere, 60 centimeters in diameter, and a weight of 450 kg. Volume of the sphere is 113000cm^3^, which gives us a density of 3,9g/cm^3^. That's heavier than most rocks (silicon at 2.3), but much lighter than iron (7.9).