Blood after poop - looks oily? Swipe

Hi all, my mini schnauzer had a beef tendon chew last week and as a result started having red blood after he poops. He always done multiple poops on a walk, but now the second+ poop he does will have blood. Sometimes it’s just blood that comes out with some oil. Poops otherwise are normal.

I think the cause is the tendon as I gave him another type at the end of Dec that caused this for 24-48 hours but then it passed.

When this happened last month for the first time, I waited a few weeks and switched the type of tendon. I thought this one would be different as it looked more like a bully type stick/chew and he’s always been fine with bully sticks in the past. However, this tendon was really big for him but he only chewed it for about 20 mins at a time / per day.

It’s now been nearly a week and he’s still getting small amounts of blood after he poop.

Poops are generally normal for him otherwise, and he’s totally his normal self — begging for food, treats (which I’ve been holding off for now) and drinking like normal.

We have a vet app on Friday but wanted to post here if anyone has any ideas. My dog HATES internal exams due to anal gland expressions in the past that were painful by the vet so I’m really anxious about bringing him and then having to do an internal exam.