Legal Question in Real Estate Law in Virginia

Yes, (in my opinion) unless he gifted the hapless animal to you.

You should, however, be entitled to reimbursement for your

reasonable costs expended in providing this animal with food, shelter,

and medical care during the time period that it was in your possession.

I would further note, however, that these reasonable costs are unlikely

to amount to the "thousands of dollars" referenced in your question.