Dogs have fleas. What do sheep have?

The faster you run, the harder it is to catch me. What am I?

I go in the water black and come out red. What am I?

I go up and never come down. What am I?

I am tall when young and short when I am old. What am I?

I am a seed with three letters in my name. Take away the last two and I still sound the same. What am I?

I disappear every time you say my name. What am I?

I am an instrument that you can hear but not touch or see. What am I?

I belong to you but others use me more often than you do. What am I?

I can fall off a building and live, but put me in water I will die. What am I?