Imagine this. Below is a Punnett square.
r R
R | rR | RR|
R | rR | RR|
So the conclusions are that there is a 50% chance of it being homozygous, or heterozygous cow. Both would be red, because the red gene is dominant in both outcomes.
Your genotype is your complete heritable genetic identity; it is your unique genome that would be revealed by personal genome sequencing. In contrast, your phenotype is a description of your actual physical characteristics. This includes straightforward visible characteristics like your height and eye color, but also your overall health, your disease history, and even your behavior and general disposition.