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It sounds like he may be constipated if he is having trouble going to the bathroom. You can try adding some pure canned pumpkin to the diet daily as this is a good source of fiber. I would give a teaspoon in the am and one in the pm.
I would try to change his diet to regular canned dog food as just chicken is not enough for the dogs needs. Rice is also a food that binds them up which my cause constipation. Canned dog food has a good amount of water in it unlike dry kibble and this should also help with constipation.
If the pup does not go soon then you will want to make sure there is not an obstruction of the bowel which would be serious and require surgery.
Here is more on constipation and causes as well as treatments http://www.petplace.com/article/dogs/diseases-conditions-of-dogs/symptoms/constipation-in-dogs