Now I have to say that was an odd thing for your vet to say. The black space in the colon just looks like gas on the xray. There is no sign of a tumor as far as I can see. And yes, a tampon could cause a blockage such that stool would be blocked and only gas would be seen. That said, if he is passing diarrhea that isn't liquid, that makes a blockage less likely. And I would note that usually dogs with blockages are vomiting food not just bile when their owner is away.
Therefore, in this case, we have a few options. First, to get a better look at the gut (since gas makes meaningful ultrasound very limited) and lot of stool in the GI can make xray difficult to interpret; you could consider fasting him by withholding food and having these tests repeated. That way you can see clearly what is going on.
Similarly, if there is doubt, you can request your vet to send the pictures from the xray and ultrasound to a veterinary radiologist (most vet schools and private referral centers have one). That way they can be reviewed by a specialist with training
in interpreting these tests to give you the best idea of what is actually there.
Otherwise, I would note that you could try some supportive care to see if we can reduce that nausea and get his gut passing material (and anything caught normally. Therefore, to start, I would suggest trying him on an antacid to see if you can settle his stomach
. There are a range that are pet safe on the OTC market and specifically you could consider trying:
* Pepcid (More Info/Dose @ http://www.petplace.com/drug-library/famotidine
* Zantac (More Info/Dose @ http://www.petplace.com/drug-library/ranitidine-hcl-zantac/page1.aspx)
* Tagamet (More Info/Dose @ http://www.petplace.com/article/drug-library/library/over-the-counter/cimetidine-hcl-tagamet)
Otherwise, while trying to settle his nausea, you can consider putting him on small meals of a light diet. Examples of an easily digestible diet include cooked white rice with boiled chicken
, boiled white fish, scrambled egg, or meat baby food (as long as its free from garlic or onion powder). Whichever you choose to offer, you can add a spoonful of tinned pumpkin (or all-bran) to bulk up his stools to push any lurking tampon through the gut.
Overall, the xray doesn't really give us a clear sign of what is causing his signs. That said a tampon is possible since they are not radio-opaque and often difficult to differentiate from soft tissue (so it could be mistaken for a growth
or tumor ). So, I would advise the above to settle his stomach and see if we can pass anything stuck. Otherwise, we'd want to consider fasting him with a view to repeating those imaging tests to see what is there better and get a definitive diagnosis for him.
All the best,