Jelly like "stuff" in stool

We ar a LOW income family of five - my husband and I owned a shepherd/samoyed for 10 yrs before we had our 3 girls (he actually passed away while we were expecting our first) - our 2 eldest were asking for a dog when we found out we were having baby #3, so we said we would wait til she was out of diapers and gave up her soother - that happened this past summer, so we went on Kijiji and other sites to see what we could find.
We found that one of our neighbour's had posted their Beagle on Kijij, so we e-mailed them for more info. They had him for sale for awhile then told us they would just give him to us! I was excited, but also a little wary as they had mostly kept him in the backyard and never seemed to walk him. I wasn't sure bout his behaviour as we had only petted him thru his fence, so I suggessted that they bring him by for a visit so we could see how our girls would be with him and he with them. The next thing we knew, they had moved!! I e-mailed them asking if they had maybe sold the dog, and they said that they dropped him off at the Mississauga Animal Shelter!!! I was really upset! So... we called the shelter and foudn out he was scheduled for neutering so we called every day til he was ready to be adopted out, and then went and got him. He has been with us since the end of Sept, and is basically a mountain goat!! He climbs and and eats EVERYTHING!!!
Recently, his stool started to become soft and he left a few "gifts" for us over night and boy did they ever smell!! So I told the girls to STOP giving him any treats. I noticed his stool returning to "normal" last 2 nights HOWEVER, today, I have found two different spots in the kitchen where there appears to be jelly and a bit of poop. Like a teaspoon full. There is a slight tinge of redness, but I am pretty sure it's not blood (mom of 3 gilrs here and yes, have had to "study" the baby poop when they weren't well) - so.... that being said, they only thing that he has different last night was a PEDIGREE JUMBONE - I read the ingiedeints (rice flour, GLYCERIN, sugar, cellulose powder, wheat flour, PROPYLENE GLYCOL, sodium caseinate, natural flavor, drid meat by-products, ......etc.) and YUCK!!! I am thinking that the treats might be making his stool have that in it. I have been reading the ingredients on a bunch of dog treats and GROSS!!!!!! I can't beleive that the big name dog food companies actually say these are GOOD for your dogs!?! I have found a sweet potatoe/duck jerky treat at Dollarama that he LOVES and are all natural!!! Only sweat potatoe and duck jerky! He didn't seem to have the runny stools when he has those.
So....... any advice would be welcomed as, like i said, LOW INCOME family here and really cannot afford to run him to the vets right now. Thanks!!