In any case, blood in the dog's stool should not be taken lightly and you should always take him or her to the vet as soon as possible. In the meantime, you can feed them white rice with a little garlic or garlic powder mixed in, boiled potatoes, green beans, or a little boiled chicken. When there is blood in a dog's stool. Yeah, it can be quite a scare, but when there is blood in a dog's stool and it doesn't always mean a trip to the emergency clinic.
If that's a valid date/time entry then excel simply stores it as a number (days are integers and the time is the decimal part) so you can do a simple subtraction. I'm not sure if 7/6 is 7th June or 6th July, assuming the latter then it's a future date so you can get the difference in days with. =INT(A1-TODAY()).
Therefore, when you want to calculate the difference between two times in Excel, you can simply subtract the time values in the same way as you would subtract any other numeric values. Cell B3 of the following spreadsheet shows a simple example of how to calculate a time difference by subtracting the time in cell B1 from the time in cell B2.