I have a 13yr old male staffie. The last few hours I have noticed he is excessively dribbling from one side of his mouth. His leg is soaked from where he's been leaning on it and so is his bed and he's only been in it half an hour or so, when he's walking round I can see drops of saliva where it's constantly coming from his mouth. He already has a few problems and is on medication for his joints and also because he is a hypothyroid dog. Any ideas would be really appreciated
Thanks