Yes it will affected it if you keep running a unfit and an over weight, Because you'll lend up inprint in its head,,
Its yapping cause its proberly frustrated that it cant come to terms with the rabbits,
Dont let it see another till you have the weight off and clocked up some miles on the bike with it,,
Then try it again on so real easy runs sitter ect get as close to the rabbit as you can..
Then you'll see if you have a yapper..!!
Also make sure theres no underlieing injurys that will make a dog yap as its twisting and turning after his rabbit..
Atb With It T 7