The two dogs have not shown any symptoms and one has already shown negative results in more recent tests, Anicom Holdings Inc. said.
While COVID-19 cases have been confirmed among pet cats in a number of countries including the United States, Belgium and France, fewer cases have been reported involving dogs overseas, according to the company.
The Anicom group launched a new service in April allowing coronavirus patients to entrust their pets to the care of its employees for free while the owners are in the hospital or isolation.
A total of 42 pets — 29 dogs, 12 cats and one rabbit — have been taken care of under the Stay Anicom program.
The company said the two dogs were entrusted to it in late July and it has continued to look after them in isolation after they tested positive. No employees who had contact with the dogs or other animals have developed health problems.
Overseas, most of the pets found infected reportedly showed mild symptoms and they are believed to have contracted the virus from humans.
In China, media reports have said some owners abandoned their pet dogs and cats apparently believing pets can transmit the virus to humans.
However, a Japanese Environment Ministry official said there has been “no evidence identifying pet animals as the source of infection” among COVID-19 cases that have been reported.