my 3yr old boxer has been up and down with his weight. no probs at last yrs check-up. tried satin balls, they worked but has lost the weight again. He is really skinny, can see hips, ribs....The other day while out for walk he pooped and a LONG (6in) "thing" came out with his poop. I could see no head or anything it actually looked like rope or piece of intestine. Was really gross!! I can not get him into vet till the 15th!!!!!!!! Any ideas??