Horse Pee... (20 characters)?

My mare's pee is very yellow and somewhat thick. There's no blood or unusual looking things in it.. just the color and texture is strange. She is eating normally and is acting normal also. She's drinking about as much as usual, too. Maybe she's not getting enough water? This isn't affecting her health at all, and her pee has been this way for awhile.. is it normal? Any suggestions/input are much appreciated!(: