Tumors of the spleen in dogs is far more common than in a cat.  There are several types of tumors of the spleen; some are benign and do not spread to other tissues.  Some are malignant and can spread (metastasize) to other areas of the body.

In-home, quick, inexpensive test kit to screen for a number of dog and cat health problems.  Alert your vet if you discover any abnormalities!

Splenic tumors of dogs can rupture and bleed into the abdomen.  The first sign of trouble is noted by the dog's unwillingness to play or interact.  Sometimes the gums will be pale and the dog may seem "out of breath" while simply resting.