The claim that 'Heartless users on Los Angeles’ Skid Row are testing their drugs on dogs' is reported in a web search result citing a nonprofit group's allegation. While Skid Row is confirmed as a location, and the allegation is present in the search results, there are no corroborating reports from multiple independent news organizations or authoritative sources to confirm this specific allegation.

The claim attributes a specific statement ('Joey Tuccio, a volunteer with Starts With One Today, told KTLA, saying vile abusers have tested their drugs on dogs to make sure they’re not laced with deadly fentanyl') to a specific person and source. While web search results mention Joey Tuccio and the topic of drug abuse/dogs on Skid Row, the exact quote and attribution to KTLA are not corroborated by multiple independent sources.

The claim that 'Starts With One Today receives frequent calls regarding animals in need, including dogs dying or being sold for drugs' is mentioned in a web search result referencing the group's activities. However, this specific detail is not corroborated by multiple independent news sources, although the general theme of animal rescue calls in the area is present.

The description of 'A photo of a black dog rescued by the group shows the pooch with a cone around his head and a rotten leg' appears in a web search result. This specific visual detail is only present in the search results provided and lacks corroboration from other independent sources.

The quote regarding the amputation ('We had to amputate the black dog’s leg because it was rotten to the bone') is attributed to a volunteer in a web search result. This specific quote is not corroborated by multiple independent sources.

The claim that 'Jonathan Parker, co-founder of the group, stated that puppies are being sold on the street and other dogs are being left for dead' is sourced from a web search result. This specific statement is not corroborated by multiple independent sources.

The detail that 'In one instance, rescuers treated a dog with severe injuries to one eye and a leg' is found in a web search result. This specific instance is not corroborated by multiple independent sources.

The claim that 'Jonathan Parker stated that a dog's owner was trying to dissect the dog's leg with tweezers while under the influence of drugs' is sourced from a web search result. This specific allegation is not corroborated by multiple independent sources.

The claim that 'Members of Starts With One Today stated that politicians are not helping the crisis' is mentioned in a web search result. While Wikipedia provides general context on political figures and the 'Today' show, there is no direct corroboration from multiple independent sources confirming this specific statement made by the group members.

The claim regarding 'LA Mayor Karen Bass announced a plan to investigate animal abuse allegations on Skid Row in November of last year' is not supported by the provided evidence. The Wikipedia results mention general election information for 2024 and LA's general description, but do not contain evidence of Mayor Bass making this specific announcement in November of the previous year.