What makes the blood thick is a dog being dehydrated ,or a blood disorder .such as the body having to much vitamin k .or not being able to process vitamin k .to each his own idea , but if you go by the directions on the bottle of vitamin b you will not over do it .trust me on that .this is what makes one run hot ,weather such as humidity changing from day to day ,not enough work load prior to hunting ,and the quality of the hog they are trying to catch.