I dunno about the horses. Arabian horses didn’t come from india. Arabians are a totally unique animal. they have a different number of ribs and vertebra than all the other horse breeds have.
I did know about arabic numerals. However, the indians quit using those numerals centuries before the arabs started using them. That’s why arabs get credit. That’s how an old indian friend of mine explained it.
I’ve read in one of the Puranas about “beautiful Sindh horses”, Sindh signifying an area of India which is now Pakistan. The Puranas are immeasurably ancient.
And I have dozens of books in my house right now with Sanskrit numerals which are the origin of “arabic” numerals. They are also extremely similar to Bengali and Hindi numerals, as those languages are more or less Sanksrit derived.
http://www.omniglot.com/language/numerals.htm
Devanagari numerals are Sanskrit and the most ancient; the ones in the link are not extremely well written but more or less okay, give the general form.
This link is a bit better in that it has the names. You can see the language connection to Sanskrit.