When you stare deeply into your beloved pet’s eyes, it may seem almost as if he or she could talk. Of course dogs can’t talk, but their body language can be very eloquent. The better you know your dog—his or her habits, appearance, and behavior—the more apparent these signs will be. Acting promptly at the first signs of illness can help prevent suffering, save money, and even save a life.

The following are common ways in which dogs tell us they’re sick. This list is not exhaustive, nor is it a substitute for professional veterinary advice. Please note that these symptoms are more worrisome in a very young, very old, or otherwise frail dog, since they have fewer defenses when illness strikes. If your dog’s behavior or appearance worries you, always consult your vet.

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