My 2 year old smaller pit bull mix seems very stuff in the neck area, yelps if we lift up her front legs, has been lightly shivering all morning. Any suggestions? She is lethargic but still gets up and around still gets excited but refuses to jump. She’s regularly a active dog. Recently had issues with fleas but on preventive now. No vomiting or upset belly so far just gas that’s usual for her. She seems to moan a lot when getting comfortable. She was wearing a blow up e collar for the past few weeks due to excessive licking from fleas or food not sure yet but got a natural food and flea preventive.