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If the needle was placed too deep and went into the muscle, the most likely complication is the puppy may scream or cry. Intramuscular injection is more painful, and there is a risk of accidentally injecting into a blood vessel or piercing a nerve. If the case of the former, the dog may have a shock type reaction and faint or collapse; in the latter, the pup may limp or have a numb leg (which may be temporary or permanent).
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