I want to create a floating boat ramp for my dogs. The dogs weigh 50 and 75 lbs each. I have seen commercial ramps using floats to stablize and support the ramp while the dog walks up it. My question is if I make my own, how many pounds of buoyancy must the floats support in order to allow my 75lb dog to walk up it out of the water. It seems that the dog will not "weigh" a full 75 lbs when he starts up the ramp. I guess at some point he gets out of the water and his full weight (plus water trapped on him) is upon the ramp. However, the ramp is secured at one end attached to the back of the boat so I presume there is some torque and fulcrum issues to consider. Please refer to the attached image. The right hand side of the ramp is attached to the boat. The left hand side is supported by two floats. So the question is how many lbs of buoyancy must be provided by the floats? Please make sure to indicate if you are answering per float or for both floats. Thanks for your help.