These are only ideas. I googled to save you time searching in case you wish to make your own. You should always make additions where needed pending your individual needs so these ready to buy kits aren’t necessarily everything you might want (or need) for your situation but great place to starft.

Helpful links to either see or purchase pre-made first aid kit:
https://www.amazon.com/gp/product/B00J59JBNY/ref=as_li_ss_tl?ie=UTF8&linkCode=sl1&tag=randallheavy-20&linkId=500b402d528f0fb0dafec2d731db019c
https://www.amazon.com/First-Aid-DELUXE-Large-Removal/dp/B014I0GD5S/ref=as_li_ss_tl?ie=UTF8&psc=1&refRID=D2596S1P6KMFY52070AV&linkCode=sl1&tag=randallheavy-20&linkId=621dd29640ec4113d197cf9b3288b84f
https://www.amazon.com/dp/B00T72ST0A/ref=as_li_ss_tl?linkCode=sl1&tag=randallheavy-20&linkId=24db3ba2f747c7c8729d30ff0aa3c2a9&th=1
https://www.amazon.com/Boss-Pet-Products-First-Large/dp/B01CA9DUNW/ref=as_li_ss_tl?s=pet-supplies&ie=UTF8&qid=1473295468&sr=1-16&keywords=First+Aid&linkCode=sl1&tag=randallheavy-20&linkId=7998b7ceeb52dbf964a6766be694165d
https://www.petcaresupplies.com/first-aid-kit-for-dogs/first-aid-treatment-153.aspx
http://www.firstaid-supply.com/consumer/cons5.html
https://mccarycaresconsulting.com/shop/first-aid-kits-for-dogs/

Top 7 Best Dog First Aid Kits:
This site shows 7 different kits, but also provides pros and cons of each. Worth checking to see if any fit your needs. Remember, you will have to add items specific for your dog and your situation so one kit may not have everything you want or need.
https://topdogtips.com/best-dog-first-aid-kit/