No two dogs are alike. Likewise, no two dog breeds are alike, especially when it comes to their health. Dog health issues range from infections to cancers and it’s up to the dog parents to keep their companions happy and healthy by understanding some common dog illnesses and diseases. Depending on the size of your doggy, some health issues are more prevalent than others. For instance, big dogs tend to deal with more bone and joint problems, whereas smaller dogs tend to suffer more with organ and breathing disorders. Again, each breed is unique, but it is important to understand what common dog illnesses and health issues affect your doggy. See below for the most common types of dog health issues and make sure to take immediate action if you think something serious is wrong with your dog.