Cant we all just get along???

I recently adopted a 2 year old Amstaff names Diesel. I also have a 6 year old lab mix named Cooper and two cats. Things have been going okay but there is still alot of tension between the two dogs. They can be in the same room but Diesel will try to hump Cooper and he does not like it!! Cooper will growl and I seperate them asap to avoid confronation between the two but I dont know what is the best approach and if they will ever get along???? Any advice would be great, thanks!

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