I recently took in a rescue normal BP baby that is about 18" long and at the time i got him, he had not supposedly eatin in 4 months. He was very weak and not very active. Now i have gotten a few meals in him and he seems to be doing a lot better but i did notice he had not pooped since i have had him (about 3 weeks now.) I just noticed last night he had a very hard "lump" about 2 inches up from his vent which i know is not supposed to be there. Any ideas on what i can do for my little guy? TIA