Hello, I am Dr. Peter a licensed Veterinarian. I would like to help. I need to ask you a few questions to be well informed and give you the best advise. There is no additional charge for information request.
1- How long has this been going on?
2- Take a look at his gums and see if they are pink like yours or pale?
3- Do you know if he got into anything or ate something out of the ordinary?
1. Three episodes...the first one happened sometime between 8am and 2pm this afternoon.
2. His gums look pink but his mouth is pretty dry...and his tounge is a little pale.
3. He eats anything and everything he can get to and we do our best not to let him eat anything but dog food, but he never has access to any chemicals, drugs or anything like that.
The concern in this case is the lethargy in presence of bloody stool. Possible causes include infections, foreign body, tumors, and less likely secondary to metabolic disorders (liver disease, coagulopathies, etc.). I would really be concern about a foreign body considering the acute nature of his symptoms. It is best not to wait and have him checked tonight; waiting could be very bad for him and even fatal. Hopefully, that is not the case, but, the only way to rule it out is with a hands on exam and some xrays. It is best you take advantage of having access to ER vet and have him checked tonight.
Hope the above helps, if you have additional questions I will be glad to answer them.