Dogs can be a person's best friend; they can also be their funniest friend! 

Casey the dog passes out from overwhelming joy
Casey the dog is very excited to see Rebecca after she was away for 2 years and passes out.
Casey's reaction to Rebecca returning home after 2 years living and working in Slovenia ... which in fairness is 14 years in dog years. Casey, was taken to the vet a few times. The vet saw this video, and everything is fine with her.