A weak immune system can pose a number of serious health risks for our furry friends.

Thankfully, there are numerous symptoms you can keep an eye out for to ensure it never reaches that stage.

Frequent illnesses are a sign of a malfunctioning immune system, especially when combined with continued low energy.

Loss of appetite is another indication there could be a problem with your dog’s natural defenses.

If he or she suddenly seems down in the dumps, that could also be a sign they are battling problems internally.

If problems persist for longer than a couple of days, contact your vet.