Wally & Reub
Boxer Buddy
For me the answer is treats, treats and more treats. Neither of my boys liked baths (showers actually) at first and Wally was just petrified of the tub but now both will hop right in and while they don't love the bath part they gladly tolerate it for the treats.
I get in the tub, bring in a whole box of treats and call whichever one goes first into the tub in an excited tone - holding a treat out so they have to jump into the tub to get it. Once they're in keep up the praise and treats, close the shower curtain and turn on the shower. I try to make it fast and punctuate often with treats all the while saying "What a good boy!" & "Heeeee's a good boy".
I get in the tub, bring in a whole box of treats and call whichever one goes first into the tub in an excited tone - holding a treat out so they have to jump into the tub to get it. Once they're in keep up the praise and treats, close the shower curtain and turn on the shower. I try to make it fast and punctuate often with treats all the while saying "What a good boy!" & "Heeeee's a good boy".