My dog barks wildly at a tree. Can calming aid cause hallucinations?

It sounds like something really agitated poor Lucky! If it is daytime, checking for anything that could have caused it such as new people in the area, strange animals, etc may let you know what the problem was. If he starts up barking again, or is agitated even during the daytime, or has other strange symptoms, having a vet take a look at him may be helpful. Hounds are VERY good at smelling and hearing things that people can't (as that's what they're bred to do) so while there may not be anything in your direct area, he could still be smelling an animal nearby! Keeping Lucky distracted with a puzzle toy, new smelly piece of food to deter his nose, or a Kong stuffed with treats may help.

It sounds like Amos is very comfortable and trusting of other dogs, which is great! :) Some dogs are simply more laid back and easy-going than others, so this isn't necessarily abnormal at all. As long as he is acting normal otherwise and you have no other reasons to believe that something is wrong, this should not be any reason for concern.

In this case, a calming tab will not ease ChikiLou. I see that she isn't spayed and she is likely acting aggressively towards other female dogs due to hormones. She will be letting them know they are in her territory and may be trying to complete for attention from male dogs. Because it's hormonally related, a calming tab will likely not help at all. The best way to help reduce this behavior is to have her spayed.

It could be that your pet had an upset stomach, leading him to drool and howl. Or he could have been suffering from pain. Given that he has eaten and calmed down, I would monitor him for now. Should his symptoms reappear, I would have him seen by a vet.

At his age, it could be a degree of canine cognitive dysfunction (senility). You would need to have Chewy examined by your veterinarian for confirmation. If this is the case, there are medications and other treatment options. https://www.petcoach.co/article/aging-gracefully-6-things-to-know-about-canine-cognitive-dysfunct/ https://www.petcoach.co/article/4-signs-of-cognitive-dysfunction-in-dogs/

Hello, Duke may be hearing or sensing something that could be causing him to be alarmed. If nothing, then make sure Duke did not get into any medications at home that could alter his mentation. If this does not change and he continue to show this behavior then have Duke evaluated by a veterinarian soon. I would have Duke evaluated tonight if his behavioral changes worsen or if you note any other signs including weakness, lethargy, vomiting, diarrhea, or worsening aggression. Hope this helps and best of luck.

I wouldn't jump to thinking the end is near from what you're seeing so far. I think he needs a general exam and full blood work to see how his organs are working. It would be helpful to get a video of the barking event to show your vet (and also probably nearly impossible, but give it a try). Also try to notice if he is aware of his surroundings when the barking episodes happen. If not, I would be more concerned about seizures, which would be more serious. I hope you find out nothing serious is going on soon!