I presume the sellers are based in Russia?
I presume you didn't pay by visa ?
You do have a claim as this is a contract to which the CRA would be relevant. Also there is a distance selling issue.
Clearly this was an animal that was not in a condition that was 'fit for purpose' within the meaning of the Act.
The problem is that they are based abroad and you did not pay by visa. You cannot sue the debit card or transfer company as they are not liable. You could sue the seller but that is not cost effective to do abroad and anyway near impossible to enforce even you were successful.
Sorry if that is bad news.
Can I clarify anything for you?
Consumer Rights Act.