[Help] All of a sudden eating very slowly and putzing with eating meals

3 year old cocker spaniel we've owned him for almost 2 years. He's always very energetic and loves going for walks and being active. He usually eats 4 times a day out of one of those roll around kibble balls. This has worked the best so that he always has food in his tummy and doesn't throw up that yellow foamy liquid bile.All of a sudden he has become disinterested in the ball. I almost have to pour it out for him or put his food in a regular dog bowl with one of those bones he has to eat around to not get bloat. He still seems somewhat disinterested in eating his food out of the bowl.Any ideas? Everything is normal just seems a little disinterested in food and takes a lot longer than "normal" to eat.TLDR: Everything else normal with dog except becoming disinterested in eating food for about the past week. via /r/dogs http://ift.tt/2qNWta4