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OK. So, we have a sluggish or weak puppy. We put it on the bitch and it won't nurse. What to do! TUBE. NO! If the puppy does not have a good sucking reflex, it will not have any peristalsis. This means the milk we force in through the tube will just sit there. When the tube is removed, it forces itself back up the esophagus, into the trachea, and ends up in the lungs. It does not travel down through the stomach into the intestine.
Now, how big is the stomach of a newborn puppy in your breed? 1/2 cc? Less? As much as 1cc? Probably not much more. That stomach is just a slightly wide spot on a narrow tube. So; let's stick 2 1/2 cc into it . Fast and Deadly. The stomach and esophagus will stretch a bit, then return to it's original shape and size after the milk runs into the lungs. Not going to raise many puppies that way.
Well then, what do we do? Easy. We give them sub-cutaneous dextrose and saline. Sugar in salt water. The solution which is used for IV therapy. All puppies need 3 things. Warmth. Water. Sugar. That' all they need right away and for an additional few days if necessary.
So, we take the weak puppy out of the whelping box. We drop a few drops of colostrum onto its tongue several times in the first few hours. Got that immunity taken care of. We keep it in a confined box with a heat source - a heating pad or light bulb, and we give subQ dextrose in saline to supply the sugar and water. We gently stimulate it to urinate and defecate. We've met all the puppies needs.
How much fluid do we give? We give enough to satisfy any current dehydration debt and to provide a cushion for an hour or two in the future. How much is that? It is enough so that when we refill the syringe with dextrose and saline, the last 10 cc injection we gave hasn't already disappeared. And it will disappear, just that fast, if the puppy is already dehydrated.
So first, we need to satisfy the back log, and then we put in some more. We want to raise a good sized lump - say the size of a golf ball on a 12-16 oz puppy. We want that golf ball to stay there a while. If it does, we can safely leave the puppy for a couple of hours. As time goes by, the fluids in this reservoir will be absorbed and the lump will disappear. Also, gravity will take a hand in removing the lump, shifting any spare fluids down around the neck.
We can keep this puppy going in this way for 2 to 4 days easily. There no danger here, if the area is clean when and where we inject, and as long as the needle is parallel to the body - not pointed down at the body. We don't want to pith the puppy (look it up). With the needle parallel to the body, the worst we can do is squirt the wall. The wall can take it. Fluids given intravenously, by contrast, would run the risk of drowning the puppy - excess fluids in the veins will force their way out through the lungs. This result is essentially the same as that of tubing. Not good. SubQ fluids are essentially outside the circulatory system - just in a repository under the skin. If a fluid defecit exists, they can be instantly drawn into the blood stream. Until then, they have no other effect on the body.
While we are satisfying the puppy's needs in this way, we will also repeatedly present a nipple to the puppy, several minutes after we have placed a drop of Karo syrup on its tongue. The Karo give the puppy an energy boost, so that when we place it on the bitch, it will make as strong an attempt to nurse as it can muster. We will also present the puppy with a bottle, as it will be easier for it to get milk from the bottle's nipple than from the bitch, most of the time, during the first couple of days.