Has he had a thorough vet check-up? Eyes, ears, teeth, joints, blood panel and couldn't hurt to do a thyroid panel. Random aggression in an older dog makes me think physical issue-- painful joint(s) maybe, ear infection or painful tooth, something that you might be jarring or bumping into and causing him to snap back?
Growling is communication and it isn't unusual for a dog to "talk" (growl) for different needs. But its a lot easier to interpret with the benefit of a long standing relationship with the dog. Growling alone wouldn't worry me, it just has to be taken in context.
Growling is communication and it isn't unusual for a dog to "talk" (growl) for different needs. But its a lot easier to interpret with the benefit of a long standing relationship with the dog. Growling alone wouldn't worry me, it just has to be taken in context.