My active dog is suddenly lethargic, sleeping, and not eating. What's wrong?

Hi. If he is acting abnormal, and its notike him, I would recommend an exam and labwork by your veterinarian. There are many things that can cause lethargy unfortunately. So without more information and testing, it is hard to say what it could be

Given the lack of clinical signs besides lethargy and inappetence, there is not much else to go on here. I would consider obtaining a rectal thermometer tomorow and checking for a fever (above 102.5), which might suggest the presence of an infection or inflammation. If you detect a fever, I would definitely suggest getting Rusty to the vet sometime soon. If there is no fever, but his condition does not get better by Monday he should be taken in for an examination regardless. You can certainly try and feed Rusty something that would normally be considering irresistible just to see if he will accept it, rather than just his normal dog food. Anyway, hope this helps and that Rusty is feeling better soon. It is entirely possible that he might just feeling a little under the weather or maybe could have eaten something he shouldn't have that upset his stomach. If this is the case, the symptoms should pass with short time.

Yes I recommend to take Ruby in to be seen by her veterinarian. When pets are sick for 24 hours and not eating well, it’s best to play it safe and have her checked out. There are many causes for not feeling well. I hope this helps and please feel free to post any additional questions.

I'm very sorry that Summer is not acting herself. Unfortunately, her symptoms are very vague and don't point to any one illness or disease process. Pretty much anything can cause lethargy and not eating. I strongly recommend you have her examined by your vet to help figure out what is going on with her especially if it has been a few days already.

This sudden change in behavior is quite concerning that Fudge is not feeling well. I'm concerned that something serious may be going on. I would have him seen by a veterinarian as soon as possible for an exam and bloodwork.

Poor Mazy! It definitely sounds like something isn't right. There are many different things that could cause decreased appetite and lethargy, so it's hard to say what might be wrong without being able to examine her and run some tests. She could have anything from liver or kidney disease, to heart disease, arthritis pain, a GI problem of some kind, or even some type of cancer. I would recommend taking Mazy to the vet for an exam when you are able to. He/she can do blood work and x-rays if needed to help diagnose the problem and get her started on appropriate treatment depending on what is found.

Poor Pocholo! It definitely sounds like he isn't feeling well for some reason. Unfortunately, these symptoms are very vague and could be caused by almost any type of illness or injury, so there's no way to say what might be wrong without being able to examine him. I would recommend taking him to the vet for a check-up as soon as you are able to - he/she can do some blood work or other testing if needed to help determine what's wrong and get him started on appropriate treatment for the problem.