Do dogs get 'Mentally Ill'?

Yes it is indeed possible!! If it has a brain (which all living things do) it can have mental problems just as any human can. I once saw this rhino at a zoo, it was running at full speed head first into a brick wall then backing up and doing it over and over. I had a class of preschoolers with me at the time and all of the teachers (including myself) couldn't tear our eyes away from the awful site of the bloody rhino. :/ last field trip to the zoo were ever taking and as for me and my future family, were NEVER going to the zoo. Not that you really wanted to hear about a suicidal rhino but... i found it interesting so i had to share. :P Hope you find out wats wrong with your dog