What Can Cause A Dog's Back Legs To All Of A Sudden Appear Weak Or Unsteady?

Hi  my dog got diagnosed with a tumor in his bowels just before christmas last year now he is finding it hard to to walk and also his back legs just keep giving up on him could this be related to the tumor

About 4 days ago my dog started shaking her back leg  I checked her underneath thinking it was something under her pawns but nothing , she went to sleep so I did not bother her when she woke up she could not stand on her back legs for nothing to go relieve her self my partner andI take sheets and fold them long and hold her with the sheets so she can get up and go she still haas her to front legs ok, she has a tumor in her liver , but she was ok  I also can't understand why but take her to the vet and please let me know what they said thank and make her comfortable and to all of you make them comfortable they depend on us

My dog is 12 yrs..old and in very good shape...last week she started to act funny...now she wont walk on her back legs.....she is eating and drinking,and using the bathroom...she sleeps a lot...what could be wrong?

There is a chance that you dog has slipped a disk in its back, or it might be having a seizure. I own mini dachshunds and this is very common with them. Seizure's can be helped with phenobarbital however over time it will cause liver damage. A slipped disk could lead to paralysis. The good news is you can operate the bad is its very expensive. I would defiantly take your dog into the vet.

Is this something that is just happening now.  Could be dizziness, but in an older dog, could be an indication or either arthritis or possibly a stroke.  If the dog continues to not be able to use his hind legs, get checked out by a vet..I'm sure there is an emergency number you call, check with your yellow pages, so you can better describe, there may be more questions that need answered before you can get to the root of the problem

I'm not sure but how old is your dog and what breed is he.  Sometimes with age and certain breeds are prone to problems with their hind end.  Please go to the vet it can be something that can be treated very easily and that would improve the quality for your dog and for you.

It could be a large number of things, something neurological, or something he ate, or an injury. I strongly suggest that you take the pup to the vet and find out for sure what it is. Hope this helps, good luck to you.

Your dog needs to be seen by a vet... Hopefully you've taken him by now?  Besides a possible broken back, he may have alternately have spine or nerve damage. 
Please let us know how he gets on .. At the vet.

Dogs get arthritis just like people. There also may be factors where you live as in Arizona there is a disease called Valley Fever that comes from the soil. They say that everyone that lives here has the disease after awhile but it affects dogs in their joints. So depending on where you live will also dictate other factors that would affect your dogs hind legs.

It could be its spine, it may need to be seen by a vet. If its young try not to over do it with exercise, no jumping after frisbees and such. I have heard of dogs ending up paralyzed from jumping up after a frisbee, there spine just snapped and then they were in a doggy wheelchair type of thing with wheels that they pulled around with the front legs.

Excessive panting in dogs is due to fever and fever in dogs can be due to infection, ticks bite, tapeworm/heartworm infestation, cancer and immune system disease. You should have given age of your dog in the question because if your dog is aged then he can have many problems which can cause weak back legs leading to walking problems. He can have arthritis, disc degeneration, disc injury, cartilage damage, bone tumor, musculoskeletal problems and hip dysplasia etc.

Complete medical history, physical examinations, radiological and laboratory investigations are needed to diagnose your dog's problem. This can be done by the vet. So, take your dig to vet.

My dog is 5 years old is Bing treated by vet for very loose bo he is on antibiotics but now he keeps looking balance with his back legs

My husband's dog broke his back or a couple of disk had to be fused together. He must have jumped off the bed too many times. I hope you don't wait too long to take it to the vet.

Your pup needs to see the vet asap. There may be a spinal problem/injury which is also effecting the nerves. You need to restrict activity and put your pup in their kennel to prevent too much movement to avoid additional damage and things getting much worse (and much more expensive). Hope your baby is feeling much better very soon.
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The most probable cause is that her legs are broken. I would take her to the vet as soon as possible.