Dog-Sitting Cane Corso

My 16 year old son is dog-sitting our friends’ dog, a darling 10 month old Cane Corso, while her family is out of the country.

Her owners let us know she had a heat about 2.5 weeks ago.

She began bleeding again today- she is eating/sleeping/playing as normal. he isn’t sure if she’s napping more, and she doesn’t smell bad.

I did a cursory search of Cane Corso first heats and saw a “Split Heat” mentioned.

I need advice on when and if I should take her to the vet.

we aren’t dog owners ourselves, but I want our friends to have peace of mind while finishing up their travels.

any thoughts?

thanks in advance!