Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose balance problems in dogs [title] Look for changes in your dog's gait. [step] Balance problems can show up when your dog's limbs appear weak. Weak limbs can make your dog appear to limp or walk differently.

Ending1: If your dog's gait is jerky when working out, it may be a sign of mobility issues. Your dog may excessively bend, walk in a cramped way, or seem to chew too hard on its leash or collar. Ending2: [substeps] Your dog might not typically walk at the same pace as his usual gait, walking slower and more rhythmically, and look miserable when you pass him on the road. Sometimes when dogs are not walking normally, gait problems develop. Ending3: Normal canine balance changes can be caused by age, either from an illness or an underlying condition. Try to help your dog see changes in its gait and figure out why the difference in mobility is noticeable. Ending4: Your dog might put their weight on one side, stagger, topple, or walk as if drunk. [substeps] For example, you might notice that your dog only likes to use the limbs on one side of their body or only likes to use their hind legs.

Answer format: ending1/ending2/ending3/ending4