I recall being informed that an inanimate object cannot be possessive. Yet I find this from a possibly authoritative source. 
So, I can say “a dog and its toy.” [Yes.] 
The adjective possessive "their" isn't it used for human possessors only? [No, not just for human beings.] 
Should I say “the dogs and their toys”? [Yes.] 
or “the dogs and its toys?” [No.] 
How about a table? Can I use the adjective possessive “its” for table even though a table cannot possess? [Yes.] 
Can I say “a table and its four legs” or “a book and its cover?” [Yes, yes.] 
How about “two tables and their eight legs?” [Yes.] 
Can I say “I look at them” for “I look at the tables?” [Yes.] 
Can "them" be used for inanimate objects? [Yes.] 
The science of language was never my interest.