This SourceWatch article is being publicized in connection to Mehmet Oz:
In 2004, complaints about Dr. Mehmet Oz’s dog experiments were cited in a report from an internal investigation into allegations of poor animal care made by Dr. Catherine Dell’Orto, a post-doctoral veterinarian. ,  See also individual reports of Dr. Oz's dog experiments.  According to the report, "highly invasive and stressful experiments" on dogs were performed without a "humane end point." AWA violations included a litter of whelped puppies killed by painful cardiac injection:
"The screams of these puppies could be heard through closed doors. All of these puppies, lying in a plastic garbage bag, were killed in the presence of their litter mates."
Subsequent applications for grants to the National Institutes of Health (NIH) by Dr. Oz have been denied. In 2004, Columbia paid $2,000 in fines to the USDA. 
However, all of the reference citations point to ColumbiaCruelty.com and StopAnimalTests.com, both of which were run by the animal rights group PETA and (more importantly) no longer exist.
I found one independent reference to animal cruelty at Columbia University in the early 2000s, but it doesn't involve Dr Oz.